Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
If some endangered species ______ in zoos, it would help to ensure their future survival.
A.will be kept
B.are kept
C.had been kept
D.were kept

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Ann has a lot of books, she has never read.
A.most of that
B.most of these
C.most of which
D.which most of them

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
By the end of this year, Nam _______ English for 7 years , but he will still need more training and experience before he masters the language.
A.will have been studying
B.has been studying
C.will be studying
D.has studied

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
She has two brothers, ___ _ are engineers.
A.whom both
B.both who
C.both of whom
D.both whom

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Linda refused ______ in the musical performance because she was sick.
A.to participate
B.participate
C.participating
D.to participating

The subject of the preceding passage was most likely Halley’s
A.childhood
B.work as an astronomer
C.invention of the diving bell
D.many different interests

Halley’s bell was better than its predecessors because it ________ .
A.was bigger
B.provided more air
C.weighed less
D.could rise more quickly

Paragraph 4 of the passage serves mainly to do which of the following?
A.Show the progress of desertification down through history
B.Propose a method for dealing with the desertification problem.
C.Describe one process that leads to desertification
D.Describe the main cause of desertification in one particular area

Look at numbers [1], [2], [3], [4] in paragraph 3 of the passage. Where would the following sentence best fit?
Each furthers the process dramatically, but they act in quite different ways
A.[1]
B.[2]
C.[4]
D.[3]

According to the passage, agriculture furthers desertification through _________- which of the following activities.
A.The repetitive planting of the same crops
B.Irrigation
C.The stripping away of native vegetation
D.Over fertilization