--I can't find Mr. Smith.
--It was in the hotel___________ he stayed.
| A．that | B．where | C．which | D．since |
I think this is the very work that we must finish ____ her.
| A．to help | B．help |
| C．helping | D．helped |
The work he devoted his time to _____ worth praising.
| A．was | B．be |
| C．being | D．been |
The theory he sticks to ______ to be of no use in our studies.
| A．proves | B．prove |
| C．proving | D．be proved |
The man you referred to _____ just now.
| A．comes | B．come |
| C．coming | D．came |
——You didn’t wait for Mr. Black last night, did you?
——No, but we ____. He didn’t return home at all.
| A．couldn’t have | B．needn’t have |
| C．didn’t need to | D．should wait have |