Supply the correct word form of the words in brackets

Supply the correct word form of the words in brackets
1. The air in the city is very.........(pollute)
2. Please listen to the lecture .........(care) 
3. If the .........cotinues, what will happen ? (Pollute)
4.He was ......that they were not coming (disappoint) 
5. He is going to ..........all the bags (collection) 
Rewrite the following sentences as directed
6. Why don't we go for a picnic on the weekend ? 
Let's........................................................
7. Let's go to work by bus 
What about .............................................
8.  Nga is a good English speaker
Nga speaks............................
9. Unless you get a visa . You can't visit the United States 
  If you...................................
10. If you don't suceed , you'll have to try it again 
Unless..........................................
11. I suggest collecting unused clothes.
 Let's .........................
12. Ba is tired . He stayed up late watchingTV. (Because)
.....................................................
13. Hoa broke the cup. She was careless.(since)
..........................................................