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_____ _____ ______ _____?