______
__________ surprised us very much that Tom should have left without a word.
| A．He | B．It | C．This | D．That |
The speaker thought it hard to make himself ___.
| A．understand | B．understood | C．understanding | D．to understand |
John has done nothing but ___ for the police.
| A．sending | B．to send | C．send | D．that to send |
Did you feel your should __ by his hand?
| A．touch | B．touched | C．to touch | D．to be touched |
I suddenly felt something cold ___ my hand.
| A．touch | B．touched | C．to touch | D．to be touched |
The young trees require ___ carefully.
| A．to look after | B．looking after | C．look after | D．looking for |