Since the 1930's chemical insecticides such as D.D.T _________ very effective in destroying disease-carrying insects.

Câu hỏi liên quan

• Choose the best answer among A, B, C or D that best completes each sentence: She began her writing career when she was only 8. I think she is a ……writer.

• Pam really fond ________ reading detective stories by Agatha Christie

• I was such nervous that I didn’t think I would pass the exam.

ZUNIA12

• Identify the one underlined word or phrase — A, B, C of D - that must I changed for the sentence to be correct: 

  The naturalist Edwin Teal illustration his books with photographs he had taken himself.

• If the water level has raised a little higher, the dam would probably have broken.

• Only when black bear has been spotted by the forest rangers will this portion of the park be closed down.

• The local economy which once used to be in crisis now depends to a huge extent on menial jobs provided by the recent development of ecotourism.

• The world’s rain forests are being cut down at the rate on 3000 acres per hour.

• The team leader demanded from his team members a serious attitude towards work, good team spirit, and that they work hard.

• Could you mind telling me the way to the nearest restaurant?

• Identify the error in each sentence: Until the invention of the telephone, skyscrapers were not consider very practical

• There was a very interesting news on the radio this morning about the earthquake in Italy.

• Identify the error in each sentence: 

  It is most important that he speaks to the Dean before leaving for his vacation.

• Disease is not as widespread than before because better preventive vaccine and vastly developed nutrition.

• The Carbon atoms of the diamond are so strongly bonded that a diamond can only be scratched with other diamond.

• The students in the dormitories were forbidden from going out after 11:30 p.m., unless they have special passes.

• Dreams are commonly made up of either visual and verbal images.

• The native people of the Americans are called Indians because when Columbus landed in the Bahamas in 1492, he thought that he has reached the East Indies.

• Choose the correct past forms and past participle forms of the following verbs:live - _______ - _______ 

• From the four words or phrases (A,B,C or D), choose the one that best completes the sentence.

   A: I think it’s going to rain again.

  B: It wouldn’t ……. me, it hasn’t stopped all week!