1. 根据句意，选用方框内的词组填空。注意形式的变化。

show up, rush out, arrive at, go into, find out

1. （1） When we  the hill, some farmers had planted many young trees.

3. （2） By the time I told her something, she said she what caused the accident.

5. （3） —Why didn't you  at the party yesterday?

   —Because I had to look after my little sister.

7. （4） Before it rained, the little boy  the supermarket with his friends.

9. （5） When my mother came back, I  to go for my football training.