---He ought to have been warned of the danger.
---_______, but he wouldn’t listen to me.
| A．He did | B．He should | C．He ought to | D．He was |
In the USA, he made a lot of friends ______ English well to make himself ______.
| A．learn; understand | B．to learn; understood |
| C．learning; understand | D．learned; understood |
Please tell me the way you thought of ______ the garden.
| A．take care of | B．to take care of |
| C．taking care of | D．how to take care of |
Whom can you trust, if not _______ ?
| A．himself | B．he | C．him | D．his |
She reached the top of the hill and stopped ______ on a rock by the side of the path.
| A．to have rested | B．resting | C．to rest | D．rest |
The result of the experiment was very good, _____ we hadn’t expected
| A．when | B．that | C．which | D．what |