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The air in this area is polluted..by . Smoking from factories
![](https://rs.olm.vn/images/avt/0.png?1311)
1 more narrow
2 more historic
3 smaller
4 slimer
5 more pollluted
![](https://rs.olm.vn/images/avt/0.png?1311)
If there is so much smoke, the air in this area will not clean
![](https://rs.olm.vn/images/avt/0.png?1311)
If there isn't so much smoke from factories, the air in this area will be clean.
![](https://rs.olm.vn/images/avt/0.png?1311)
1, Don't leave the computer on when you leave
→→ Turn ......the computer off when you leave...........
2, They wanted to apologize for their behavior: that's why they paid for dinner
→→They paid for dinner in order ......to apologize for their behavior.
3, When I was a child , I usually went to the local park every Saturday afternoon
→→ When I was a child, I used ........to go to the local park every Saturday afternoon....
4, Their teacher is making them study hard
→→ They ....is being made to study hard by their teacher..............
The air is polluted with a lot of smoke from factories in the area .
The air in the area is polluted with a lot of smoke from factories.