Tom, did MrLi join you in your discussion? —- No, he _____, but he happened to have fallen ill

round the Water Cube, we were then taken to seethe Bird’s Nest

How about buying Sam a mobile phone? After all, he isn’t a boy any more.— I think it necessary, for we sometimes want to make sure if he _______ home for dinner[ ]

I am good at playing the piano, but Lucy iseven ________ at it.

Many people do not realize the importance of health ________ they have fallen.