______ sex has its own physical and psychological characteristics．
A. Every
B. Each
C. Both
D. Neither
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He got me ______ his parents when he joined the army.
A. look after
B. to look after
C. look on
D. to look on
— When ______ leaving for Toronto, Canada— We are planning to set out at 10 o'clock.
A. are we
B. will we
C. we will
D. we are
Don't leave your books near the open fire. They might easily ______.
A. catch to fire
B. catch fire
C. catch up fire
D. catch with fire
100,000 babies ______ born in this hospital every year.
A. are
B. were
C. would be
D. have been
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