What did you do yesterday—My brother took two friends of ________ to play chesswith us. But I don’t’ know _______ of them.

How much shall I pay for the phone call—You________. This is free of charge.

My son seldom has _______ breakfast.—It is _______ unhealthy lifestyle. You must ask him to change it.

_____ do you usually go to school—By bus.

Where is Li Ping –He’s _____ the library.