Mike would rather ________emails to friends while John prefers________ phone calls.
Everyone in our class played a part _________ our next trip.
— Do you like this MP3 player, Tom?— Yes. It can play beautiful music, ______ it’s very expensive.
The earth is our home. I hope there will be more trees and ____ pollution.
The teacher is ______ Tony, because he often sleeps in class.
If you go to the party, you ________ a great time.