You are _____to type quickly when talking to each other on QQ so the other person doesn’t get bored.

I hate it when she calls me at work—I’m always too busy to _____ a conversation with her.

The boy doesn’t know the answer _________ the teacher’squestion.

Where is Tom—He is practicing _____ English _____ he can win the speech competition.

ny people, paper is ________ better material, because ________process for recycling paper seems much easier.