1. We decided not to go out for meal _________ we were too tired
2. My shoes are dirty. I'd better take them ________before I come in.
3. Who is going to __________ your children when you're at work?
4. Mary's eyes are weak, __________, she has to wear glasses.
5. Our energy will soon come to an end if we don't__________ it.
6. I like bananas, __________my brother doesn't.
7. Can you turn................ the light? It's too dark.
8. There are............ saving methods and inventions to use solar energy.
9. A new air-conditioner will be................... this morning.
10. Scientists are looking for an.............
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Sinh Học lớp 12
