1.(whether) I can finish the work in one week
2.(that) we have met there
3.what he has been through
4.what I said
5.(that) he comes to school late occasionally
6.(that) you'll be catching up soon
7.(that) he failed mathematics
8.Who stepped on the moon for the first time
9.(that) he didn't attend the meeting yesterday
10.(that) we cannot visit Guilin this summe