用括号中所给动词的适当形式填空。
1. There’s no reason ________ (come) to school late today.
2. I ________ already ________ (finish) my homework, so I can play now.
3. Email English is a new kind of ________ (write)English in the modern world.
4. Many man-made satellites ________ (send) up into space so far.
5. It's my turn ________ (clean)the classroom.
