3.The last time I did volunteer work was a month ago.(for)

4.How long have you been a member of Be a Buddy? (join)

5.This is the first time he has been to SaPa.(before0

6.They have live here for ten years.(ago)

Giúp mình với mình đang cần gấp

2.It rained yesterday,so I stayed home. (because)

1.He has had a cold for two days.(ago)