24. Our teacher recommends that we _____ as attentive as possible when we visit the museum.
A. are
B. shall be
C. were
D. be
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25. Only when you have acquired a good knowledge of the field, _____.
A. you can pass the exam
B. you passed the exam
C. can you pass the exam
D. you will pass the exam
26. The student's _____ French well helped him a lot in learning English.
A. know
B. to know
C. knew
D. knowing
27. There are many children and adolescents ______ behavior is generally unacceptable.
A. who
B. whom
C. whose
D. that
28. ____ the Atlantic Ocean crosses the equator, the trade winds cause a flow of water to the west.
And
B. Where
C. At
D. That