Choose the best answer:
Ba dropped his watch when he was ____ the bus

Choose the best answer:
Even though the start was delayed by the inclement weather, the project was completed as ------- scheduled

Choose the best answer:
It's reported that by the end of this month the output of cement in the factory ____ by about 10%.

Choose the best answer:
I ____ to help students at a special school twice since I finished grade 11

Choose the best answer:
The players__________ to be at the stadium at 3 o'clock

Choose the best answer:
Don't put the blame _______________ me for your mistakes

Choose the best answer:
The Editor reserves the right to ...... readers’ letters

Choose the best answer:
Water is of vital importance to all living things. Without it, all living things will surely die. We also use a great (16)______ of water daily in our homes, in factories, and in power stations. Most of this water is fresh water and it comes to us from reservoirs, rivers and lakes. The Earth's surface is (17)_____ by large areas of water which we call oceans and seas. If you have tasted the water from the sea, you will know that, unlike fresh water, seawater tastes salty. This is due to the (18)_____ of sodium chloride which comes from the land. Rivers carry it to the sea. Although neither salt nor fresh water has any color, the sea often looks blue (19)______ the sunlight. The reason is that sunlight is made up of many colors. Some colors disappear quickly in the sea but blue light bounces back or is reflected, to the surface. This makes the sea look blue. (20)______ , a stormy sky will make the sea look grey

Choose the best answer:
Let’s go to the movie, _________?

Choose the best answer:
The newly released film _______ on a real crime which took place in 1999

Choose the best answer:
Many of those old buildings will soon be pulled ____________

Choose the best answer: 
Scarcely had Jake ______ the book report when Alan came in

Choose the best answer:
Humans should try to maintain biodiversity as they ____ a lot from it

Choose the best answer:
This is a very busy office and in your new position you will have to be able to think on your ________

Choose the best answer:
How very lucky you were! You _________ in the crowd

Choose the best answer:
Justin Bieber is a______. Everyone adores his voice

Choose the best answer:
Don’t disturb her, she _____ her homework. She _____ for 2 hours

Choose the best answer:
In the early 21st century, with the _____ of mobile communication technology, the mobile phone has emerged as a new and unique channel.

Choose the best answer:
Many groups worldwide are trying to develop vaccines that protect against a wide range of coronaviruses and prevent (26) _______ pandemic. These efforts have now been boosted by the discovery that some healthcare workers had pre-existing immunity to the SARS-CoV-2 virus during the first wave of the pandemic. During the first half of 2020, around 700 healthcare workers in the UK were tested weekly as part of a crowdfunded study called Covid Sortium. Most of these people, who wore protective equipment, never tested positive for covid-19 in PCR tests or developed covid-19 antibodies – proteins that (27) _______ to the outside of viruses, preventing cells from being infected. (28)_______ , when Leo Swadling and Mala Maini at University College London and their colleagues looked more closely, they found some of those (29) _______ tested negative had a protein in their blood that is linked to covid-19 infection, as well as T cell responses to the SARS-CoV-2 virus. T cells are (30) _______ of the immune system

Choose the best answer:
She’ll take the flight for the early meeting, ______?

Choose the best answer:
Parents are always willing to lend a sympathetic ____ to their children when they have problems