请将下列句子改为否定句，每空一词（含缩写）。

1. Li Ming receives an e-mail.

    Li Ming                         an e-mail.

2. My English will become very good.

    My English                          very good.

3. He can come to our school.

    He                          to our school.

4. They had a good time in Qingdao.

    They                         a good time in Qingdao.

5. I wanted to go to the big store to buy something.

    I                          to go to the big store to buy anything.

6. Sit here, please. 

                              here, please.

7. My mother is washing the clothes.

    My mother                           the clothes.

8. There are some desks in the classroom. 

     There                          desks in the classroom.

波纹补偿器适用于（）或（）两大且工作压力低的管道。