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Audience members  ______  to switch off all electronic devices if they attend any of the presentations scheduled throughout the conference.

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WHY DO ANIMALS GO EXTINCT? Different kinds of animals have appeared and disappeared throughout Earth’s history. Some animals go extinct because the climate (41)_______ they live changes. The climate may become wetter or drier. It may become warmer or cooler. If the animals cannot change, or adapt, to the new climate, they die. Some animals go extinct because thay cannot (42) _______ with other animals for food. Some animals go extinct because they are killed by enemies. New kinds of animals are always evolving. Evolving means that the animals are changing (43) _______ from generation to generation. Small differences between parents, children, and grandchildren slowly add up over many, many generations. Eventually, a different kind of animal evolves. [evolve: tiến hóa] Sometimes many of the animals on Earth go extinct at the (44) _______ time. Scientists call this a mass extinction. Scientists think there (45) _______ at least five mass extinctions in Earth’s history. The last mass extinction happened about 65 million years ago. This mass extinction killed off the dinosaurs.
(41)..........................

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It took three and a half hours .................. to Singapore.

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The organizers of the fundraiser ------- a to-do list to hand out to volunteers.

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Please phone this number for more ....................

Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions.

 Those people say (A)that it is (B)such polluted air that they (C)can't breath, (D)don't they?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. 
The first thing that is included in the "living together” (23) ______ is the expected good relations with your family. This also involves sharing equally the housework. Lots of people think that everyone should share the housework (24) ________, but in many homes parents do most of it. To certain minds, many families can't share the housework whereas they should try it. In fact, sharing the housework equally is not very possible because of the families' timetable. So, it is somehow believed that children and parents must do things together. For this they can establish a housework planning.
(25)_________, housework's contributions of the teenager make him more responsible. He will think that he has an important role in his family. According to researchers, teenagers should share the housework because (26) ______ will help them when they have to establish their own family in the future. Too many teenagers and young adults leave home without knowing how to cook or clean, but if parents delegate basic housework to teens as they are old enough to do it, they won't be destabilized by doing the housework in their new grown-up life.
It can be (27) ________ concluded that many parents don't really prepare their children for future, because they don't stimulate them to learn how to run a house. If parents get them responsible, teens will be more responsible and that will improve family's life.

It can be (27) ________ concluded that many parents don't really prepare their children for future

Choose the correct answer to each of the following questions. "In the case of central Africa's forest elephants, _____ are harder for tourists to see and therefore attract fewer visitors, the costs of protecting them exceed the benefits from tourism."

The bold way in which Margaret Mead defined the terms “family” – based as much on choice as on biological relationship – is possibly the most enduring of her legacies.

If one wants to take part in volunteer organisations such as Green Summer Camp, Green Saturday Movement, Blood Donor, he/she will  have to ______an application form.

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We’ll make this beach clean and .................... again.

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He can’t get home .............. he has the ticket.

There’s no need to throw that shirt away. It can easily be ____ .

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined bold word(s) in each of the following questions: 

Some operations many have to be halted unless more blood donors come forward to help.

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They are talking about the ......... circles on the fields.

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Employees at Branford Computing Group are expected to respond to all technical support questions  __________  24 hours.

You should wear warm clothes in winter, _________ you will catch cold.

________ is destroying larger areas of tropical rain forests.

Over 120 ................. of birds have been recorded in this national park.

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They spent all morning .......... their homework.

Stacey seems like a bright student. She′s always the first ______ her work.