-----Can you remember this park? We______here. ------Sure. But now I________in that swimming pool.A. are used to take a walk; am used to swim B.used to take a walk; am used to swimming C. are used to taking a walk; am used to swimming
--You don’t look ______ today. What’s wrong? --It’s the bad fever.
Sometimes parents find ______ hard to communicate with their children.
Nowadays scientists are working hard to find out ______ to do with air pollution.
Good teachers can usually give the students______ advice on their study.
Chinese people have been using paper for over______ years.