1. During the 1970s, the air in Los Angeles _____(fill) with smog.
2. A lot of work ____(do) to improve the air in the past 10 years.
3. We will go to the park when it stops_____(rain).
4. This kind of facial masks _____(sell) well and they _____(sell) out already.
5. Dad, please give me a hand to open the door. It ____(not open).
6. My husband ____send me folowers every day before we got married, but now he never does.
A should
B used to
C was going to
D was afraid to
7. It's cloudy now. But the weather report says that the clouds will _____ soon.
A come out
B lift
C appear
D elevator
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