We will go to the park if it____ tomorrow.
| A．won’t rain | B．don’t rain |
| C．didn’t rain | D．doesn’t rain |
Don’t touch the machine_________ the teacher allows you to.
| A．if | B．unless | C．since | D．that |
-I’m afraid the meeting has begun. -Don’t worry. It ___ until the bell ____.
| A．doesn’t begin ;rings | B．won’t begin ; will ring |
| C．won’t begin ;rings | D．doesn’t begin ;will ring |
I was very exciting _______ I heard the news that the high-speed rail would be built from Guangzhou to Xiamen.
| A．after | B．when | C．until | D．while |
We are not sure if it _____ tomorrow . If it _____, we won’t go hiking .
| A．rains ; rains | B．will rain; will rain |
| C．will rain ; rains | D．rains ; will rain |
We’ll go to the park if it ___________ tomorrow.
| A．won’t rain | B．don’t rain |
| C．doesn’t rain | D．rain |
Take a map with you while traveling ________ you have a guide or know the city well．
| A．since | B．if | C．unless | D．because |
Jim was listening to music _______his sister was playing with a toy.
| A．until | B．while | C．because | D．after |
——I think Paul is __________ a careful person that he seldom makes mistakes.
——But this time he did. He was __________ nervous that he made a tiny mistake.
| A．so; such | B．very; so |
| C．such; that | D．such; so |
_______ the street, don't forget to watch the traffic lights.
| A．While crossing | B．While crossed |
| C．While being crossing | D．While be crossed |
The Greens will visit Yueyang if they _____ to China.
A. comes B. come C. will come
If Jim ______ free tomorrow, I will ask Tom to go instead.
| A．doesn’t be | B．isn’t |
| C．won’t | D．won’t be |
— The air pollution is terrible.
— It will be worse ________ we take action to protect the environment.
| A．if | B．unless | C．until | D．when |
—I don’t know _______he will come tomorrow. _______he comes, I’ll tell you.
—That’s a deal!
| A．if, Whether | B．whether, Whether |
| C．if, That | D．if, If |
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