用所给动词的适当形式填空。
1. He (enjoy) every year of junior high school.
2. Don't forget______ (close) the windows when you leave the classroom.
3. Would you please ____ (not sit) on the desk?
4. Mr Li _____ (teach) here since 1987.
5. He would never think of______(let) his daughter marry a fellow like you.
