Choose the sentence that best combines each pair of sentences in the following questions.
Trash cans have been placed all over campus. Students still throw garbage on the ground.
A.Although trash cans have been placed all over campus, students still throw garbage on the ground.
B.Because trash cans have been placed all over campus, students still throw garbage on the ground.
C.Unless trash cans have been placed all over campus, students still throw garbage on the ground.
D.When trash cans have been placed all over campus, students still throw garbage on the ground.

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A.suspicious
B.suspicion
C.suspiciously
D.suspiciousness

Everyone ______what they have to do, don't they?
A.knows
B.know
C.does know
D.have known

Choose the underlined part that needs correction.
Species become extinct or endangerment for a number of reasons, but the primary cause is the destruction of habitat by human activities.
A.endangerment
B.reasons
C.destruction
D.by human activities

Choose the underlined part that needs correction.
As soon as Mary will graduate next month, she will return to her home town.
A.soon as
B.will graduate
C.return
D.home town

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
If you ________ a book, you have a brief look at it without reading or studying it seriously.
A.dip into
B.put away
C.pick up
D.put down

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Most of the air pollution results ____ the burning of fossil fuels, motor vehicles, factories, aircraft and rockets.
A.in
B.to
C.on
D.from

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
If she hadn’t helped her husband, he ______________ his project.
A.won’t have finished
B.couldn’t finish
C.couldn’t have finished
D.won’t be finished

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The Vietnamese boy was regarded as a hero __________ he dedicated his life to his country.
A.although
B.because of
C.providing
D.because

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Geography is a very interesting subject. ________, very few people study it thoroughly.
A.And
B.However
C.Moreover
D.So