—Guess what？I came first in that contest.
—Great！You ________ a lot during the past two weeks.
| A．must practise | B．should practise |
| C．should have practised | D．must have practised |
I found it __________ the purport of his speech.
| A．was difficult to understand |
| B．difficult to understand |
| C．difficult understand |
| D．both A and B |
The person is very nice __________.
| A．to work with | B．to work |
| C．to be worked | D．to be worked with |
You are so __________ your car.
| A．silly not have locked |
| B．silly not to have lock |
| C．silly not to have locked |
| D．silly not to lock |
Attending this course will be of advantage for anyone __________.
| A．hoping to promote | B．to hope to promote |
| C．hoping to be promoted | D．hope to be promoted |
Nowadays people sometimes separate their waste to make it easier for it __________.
| A．reusing | B．reused |
| C．reuses | D．to be reused |