—All the oil in the world will ______ some day.—Yeah. What shall we use at that time?
Regular exercise is important, ______ it's never a good idea to exercise too close to bedtime.
_______, if you are_______, you can share with us and make music.
I want to buy a good CD but_______ was available from the shop.
My friends have given me lots of_______.They're very useful.
The teacher came into the classroom ___ a smile on her face. A. in B. to C. with