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1.Of all the economically important trees, palms have been ___.
A.the last studiedB.study the least
C.study less and less
D.to study the less
2.Not only ___ to determine the depth of the ocean floor, but it is also used to locate oil.
A.to use seismologyB.is seismology used
C.seismology is used
D.using seismology
3.It's high time someone ___ him to stop behaving like a child.
A.will tellB.told
C.tell
D.should tell
4.___ the English examination, I would have gone to the concert last Sunday.
A.In spite ofB.But for
C.Because of
D.As for
5.The morning class ___ over, students rushed out of the classroom for lunch.
A.wasB.is
C.having been
D.being
