You shouldn’t have the machines ______ all the while. You ought to have them ______ now and then.
The _____ you study, the _____ you’ll be in it.
My sister doesn’t look ______ my mother, but she speaks ____ my father does.
----I’d like to go shopping with you, but I have a meeting _______. ----If you don’t go, ________.
His parents died in the strong earthquake, so he was _____ in the SOS Village.
Because of the rain, we’ll have our P.E. class in the classroom _____ the playground.