Dad. Why I should stop__________ computer games? —For your health, my boy, I’m afraid you _____________.

Which of the two English dictionaries will you buy?——I’ll buy ________ of them, so I can give one to my friend Helen.

Lei Feng always _____ others first.

Encourage your children to try new things, but try not to_______ them too hard.

Mike lost his key. ______ couldn’t enter the room.