My grandpa is in his seventies. He’s ____ to take the bus for free.

Are the keys yours?－No, they aren’t _____. I think they’re Jason’s.

Could you tell me what he said just now? — Sorry, I_____ what was happening outside.

You should learn English by using it.—What ____useful advice! Thank you very much.

Mr Li, I can’t understand everything in class.— Don’t worry! I’ll ______ the main points at the end.