1. 选词填空

play    not be    seem    swim    let

1. （1） If it sunny tomorrow, we will not go for a picnic.
3. （2） ​Jerry often tricks on his friends?
5. （3） Sandy, don't across the river. It is very dangerous.
7. （4） The boy often off fireworks after watching the Spring Festival Gala.
9. （5） —He unhappy today. Why?

   —Because he lost his dog.