Without gravity, we _____ walk on the ground as freely as we do now.

Without gravity, we _____ walk on the ground as freely as we do now.

A．couldn’t         B．mustn’t          C．shan’t           D．needn’t

 The gravity on the earth is much ______ that on the moon, do you know why?

The gravity on the earth is much ______ that on the moon, do you know why?

1. A.
   as strong as
2. B.
   strong than
3. C.
   so strong than
4. D.
   stronger than

Without gravity, we _____ walk on the ground as freely as we do now.

1. A.
   couldn’t
2. B.
   mustn’t
3. C.
   shan’t
4. D.
   needn’t