用所给词的适当形式填空。

1. He said he _____ (give) me the pen the day after tomorrow.

2. He told me _____ (not swim)in the river alone.

3. The old man _____ (buy)a color TV next week,won't he?

4. What _____ your sister _____ (do) at that time?

5. Listen! The children _____ (sing)in the classroom.

6. _____ you _____ (write) when there was a knock on the door?

7. She put the bag on the desk and _____ (leave) for the conceit with her mother.

8. The old woman didn't open the door or _____ (answer) the phone call.

9. She said she _____ (be) better if she went to the hospital earlier.

10. The boy told me that he was going to be a teacher after _____ (finish) his studies.

工艺上对换热器的换热要求为换热器的（）。