1. 从方框中选择适当的单词完成句子

useful,  fun,  busy,  hour,  lesson

1. （1） —When do you have an art ?
   

   —On Friday afternoon.
   

3. （2） I have no time. I'm really.

5. （3） The teacher says the math is very , but I think it's difficult.

7. （4） Our Chinese teacher is Mr. Wang.He is great.

9. （5） After class we play volleyball for an.