―Could I use your computer for a few moments, please?  ― _____. I’m not using it myself.

---Are you going to Tom’s birthday party?---________．I might have to work．

— I visited the Purple Mountain Observatory last Sunday.—______ Why didn’t you tell me earlier?

一why did you come in without my permission?一       ．I won’t be have like that again．

---Do you allow your kids go out alone at night? ---_____. They are not old enough.