Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
We ______ walk all the way home. We______ take a taxi.
A.needn’t / can
B.would rather not / must
C.ought not to / might
D.could not / had to

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The water is __________. You can’t drink it.
A.pollutant
B.polluted
C.pollution
D.polluting

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
The whale shark has long been considered a(n) ______ species as its natural habitat is seriously damaged owi
A.endangered
B.endanger
C.dangerous
D.danger

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
As a child, I had an___________friend called Polly.
A.imaginative
B.image
C.imaginary
D.imagine

Mark the letter A,B,C,or D on your answer sheet to indicate the correct answer to each of the following questions.
Internet _______ has helped bloggers share their experiences and opinions easily and quickly.
A.connection
B.connecting
C.connectivity
D.connector

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Water volume in rivers in central Vietnam will decline by 30 to 50 percent, potentially leading to a _______ between April and June.
A.scarify
B.scarcity
C.scarcely
D.scarce

Choose the best answer to complete the following question.
Students can gain _______ benefits from learning to work together.
A.considering
B.considerate
C.consideration
D.considerable

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Don’t worry. He’ll do the job as _______ as possible.
A.economic
B.economizing
C.economically
D.uneconomically

Choose the best answer to complete the following question.
Most people can ______ clearly between a real and stimulated smile.
A.difference
B.differ
C.different
D.differentiate

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The ______ horse began to run as fast as he could.
A.frightening
B.frightful
C.frightened
D.frighten