IV. Words form:
1. To keep the air unpolluted, people ought to use solar energy to create electricity.
2. Mr Brown is a famous environmentalist in the town.
V. Rearrange:
1. When you leave the classroom you must remember to turn off the fan.
2. We were disappointed that he never replied to our letter.
Chúc bạn học thật tốt nha. :)
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