—Is Mr. Smith over there?—It ________ be him. He has gone to Beijing on business.
_______ you do, don’t miss this exhibition, for it’s so hard for me to get the tickets.
You shouldn’t watch TV____ school nights.
--- I can’t fall asleep. --- You get up and try to do something ______lying in bed.
________ , I know it doesn’t matter.
It’s bad for your health to go to work ______ breakfast.