Eddie is eight years old, but we have seven candles only, we need ________ candle.
---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.
We won’t put off our plan __________ it snows heavily tomorrow.