I ___have written to him because he phoned me shortly afterwards.
| A．ought to | B．must | C．couldn’t | D．needn’t |
They made a bet _____the white horse.
| A．for | B．with | C．on | D．in |
.I was about to leave _____ the telephone rang.
| A．then | B．when | C．that | D．and when |
Children under 10 are not permitted _____ the film.
| A．to see | B．seeing | C．saw | D．watched |
The bird hid _____ food inside trees for the winters.
| A．a number of | B．a large number of |
| C．the number of | D．a great many |
--What do you think of the play?
--Oh, excellent! It’s worth a second time.
| A．seeing | B．to see | C．to be seen | D．being seen |