possible ________ get to the top of the mountain before dark?

1. A.
   Are they; to
2. B.
   Is it; they
3. C.
   Is it; for them to
4. D.
   Is it; of them to

 Is _____ possible to fly to the moon in a spaceship?

1. A.
   now
2. B.
   man
3. C.
   it
4. D.
   that

1. Every possible means should be made full use of _______ the lives of the injured people in subway tunnel collapse

A. rescuing B. to rescue C. rescue D. being rescued

 Is _____ possible to fly to the moon in a spaceship?

　 A. now 　 B. man  C. it 　 D. that

All possible means        to save the wounded soldier.

A.has been tried                                               B.have been tried

C.is to be tried                                                        D.are trying