I it to him if he didn’t understand.
| A．shall explain |
| B．will explain |
| C．would explain |
| D．explain |
The continuous rain ______ the harvesting of the wheat crop by two weeks.
| A．set back. | B．set off | C．set out | D．set aside |
In 1989, a(n) _______law was passed by the United Nations to stop people putting waste into sea.
| A．national | B．local | C．internet | D．international |
Whenever a big company ______ a small one, the product almost always gets worse.
| A．gets on with. | B．cuts down | C．takes over | D．puts up with |
In the low latitude area, it is usually very _____ all the year around.
| A．warm | B．hot | C．cold | D．heat |
She ______ her trip to New York because she was ill.
| A．called off | B．closed down. | C．put up | D．went off |