He had promised to come and help us, and ___.
— We are having a party this evening. — __________.
---I’m going to Britain?---How long _________ you _______ in Britain?
After Billy said he would ride a bicycle safely, his father _____ to him and bought him one.
Once we _____, we should work hard until we succeed.
The one and only thing I ____ is whether you take a good rest!