________ caused the accident is still a complete mystery.
| A．What | B．That | C．How | D．Where |
— Do you think an advertisement is ____ help when you look for a new job?
— Well, it all depends. Anyway, it gives me more of ____ chance to try.
| A．a; a | B．the; the | C．a; the | D．/; / |
.The basketball match will be put off if it ________.
| A．will rain | B．rained | C．is raining | D．rains |
When a pencil is partly in a glass of water, it looks as if it ________’
| A．breaks | B．were broken | C．has broken | D．had been broken |
._____from heart trouble for many years, his father has to take some medicine with him wherever he goes.
| A．Having suffered | B．Suffering | C．Suffered | D．Being suffered |
To be _____debt is to be ____danger.
| A．in ,on | B．on , in | C．in , in | D．of , at |