Dad, you have worked for so long time. Stop and have a rest.
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.
______ he talked with her for a long time, he failed to convince(说服)her.