1. (2019八下·浙江期末) 用方框中所给单词的适当形式填空，每词仅用一次。

nature   eighty   they   ride    decide

1. （1） My grandfather is going to have his birthday this Sunday.
3. （2） We'll go for a picnic tomorrow. How about the bikes there?
5. （3） They enjoyedat the party last weekend.
7. （4） Have youwhat to do after school?
9. （5） We should do more things to protect our environment.