26. The student's _____ French well helped him a lot in learning English.
A. know
B. to know
C. knew
D. knowing
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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
29. I'd rather you _____ anything about it for the time being.
A. didn't do
B. not do
C. not to do
D. don't have to
30. It is not always possible to foresee the obstacles _____ your way towards an ambitious goal.
A. blocked
B. blocking
C. to block
D. to blocking