We ________ last night, but we went to the concert instead.
| A．must have studied | B．might study |
| C．should have studied | D．would study |
----- We haven’t heard from Jane for a long time.
----- What do you suppose ______ to her?
| A．was happening | B．to happen |
| C．has happened | D．having happened |
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 |