_______ and you will make rapid progress.
---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!
“Please open the window,” he said to me.→He ________ me _______ the window.