根据中文提示完成句子

1、他跑得很快，我们跟不上他。

He ran so fast that we couldn't_____ ______ ______ him.

2、这个老人严重受伤,必须马上送往医院。

The old man is badly hurt, he______ ______ ______ ______ the hospital

at once.

3、在下雨天，我宁可待在家里也不愿去看电影。

I    ___ _____stay home_____ _____go to see a film on a rainy day.

4、自从他加入足球俱乐部以来，已有3年了。

It's______  ______ since he_____the football club.

5、你能告诉我他们什么时候到达吗?

Could you tell me_____ _____  ______ _____?