__ carefully if any change occurs when doing experiments in the lab..
| A．Observe | B．To observe |
| C．Observed | D．Observing |
相关试题
It is not immediately clear the financial crisis will soon be over.
| A．that | B．what | C．when | D．whether |
A terrible flood hit Gongshang in Yunnan province, 200 persons.
| A．killed | B．killing | C．to kill | D．kill |
We shouldn’t complain about being poor because many families are much than we are.
A．wors e off |
B．badly off | C．well off | D．better off |
—What do you want to do next? We have half an hour until the basketball game.
— . Whatever you want to do is fine with me.
| A．It just depends | B．It’s up to you. | C．All right. | D．Glad to hear that. |
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