After months of voyage, Columbus arrived in what later to be a new continent.
| A．had been proved | B．was proved | C．had proved | D．proved |
Michaelbe a policeman, for he is much too short.
A. needn’t B. can’t C should D. may
The teacher apologized late.
| A．to his students to arrive | B．to his students for arriving |
| C．at his students to arrive | D．at his students for arriving |
----May I open the win
dow to let in some fresh air?
----
A. come on! B Take care! C Go ahead! D Hold on
It took me a long time before I was able to fully appreciate what they _____ for me.
| A．had done | B．did | C．would do | D．were doing |
He had a wonderful childhood, _____ with his mother to all corners of the world.
| A．travel | B．to travel | C．traveling | D．traveled |