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I won’t go unless you ................. me the money back.

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The factory is working below _________ because of the shortage of essential materials.

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He got wet ................. he forgot his umbrella.

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Tornadoes are ........ storms which pass overland below a thunderstorm.

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Mary ................. write to me last year.

Students' motivation for language learning really varies.

Read and choose the appropriate option: 
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.
(43)..........................

Many nations have laws offering protection to these species, such as forbidding hunting, restricting land development or creating _______.

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Many reports in newspapers talked a lot about the ............. of UFOs.

Choose the correct answer in each sentence.

Company policy requires that all staff members be at their desks before 9:30 A.M.,   _________ unforeseen circumstances.

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He ................. with friends in an apartment in HCM city since last week.

Choose the best answer among A, B, C or D that best completes each sentence: The project must be completed within a specific time …...

He ___ through with his plan although all his friends advised him to abandon it.

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: 

He was asked to account for his presence at the scene of crime.

 There ………… no schools in this area before liberation. A. is B. were C. was D. has been

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She gave a long .................about unemployment in Vietnam. 

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

There are different courses available for students to select.

She started the course two months ago but dropped _____ after only a month.

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The handwriting is completely ______ . This note must have been written a long time ago.

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: 

There was a long period without rain in the countryside last year so the harvest was poor.