1. I wonder why Mary is so nervous.
2.He asked me yester if I would take part in the sports meeting.
3.They don't know if I have been ready for match, if they know it,they perhaps can defeat me.
4.The teacher told us that we should keep quiet in public.
5.Please tell Lily when Mr.Xu will arrive at Shenzhen, when he comes,Lily can meet him at the airport.
6.If you try your best to work,I think nothing can stop you (from succeeding)
7.I don't believe he tells a lie,doesn't he?
8. He didn't know who was speaking.
9. It all depends on whether he behave well?