1. (2015八上·临海期末) 用方框中所给单词的适当形式填空。每词限用一次，每空一词。

cheap,   although,  turn,   pollute,  piece

1. （1） Put the corn in the machine and then it on.

3. （2） To stop the river , we shouldn't pour dirty water into it.

5. （3） My car runs well it is very old.

7. （4） The hotel is always crowded because it's the in town.

9. （5） They usually put the turkey between the two of bread.