-It’s one of the things in the world to stay with friends.-I agree. It always makes us relaxed.
I hate people _______ talk much but do little.
---Where is the scientist ________ gave us the talk yesterday? ---He has gone back to Qinghua University.
The letter _______ I received from him yesterday is very important.
---Does the teacher know everybody _______ planted the trees?· ---Yes, he does.
I don’t know if he tomorrow. If he , I’ll meet him.