Listen! One of the boys ______ in the room.
---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.
Take a map with you while traveling ________ you have a guide or know the city well.