单项选择题

(By the time) Neil Armstrong and Edwin Aldrin, Jr. walked on the Moon (in July 1969), there (will have) been many (space) expeditions.

A．By the time
B．in July 1969
C．will have
D．space
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He has (less friends) (in) his classes now (than) he (had) last year.
A．less friends
B．in
C．than
D．had
单项选择题
John stopped (to write) his letter (because) he had to (leave) (for the hospital).
A．to write
B．because
C．leave
D．for the hospital
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