--Who is the person talking with you just now? -- Well, if you ______ know, his name is David.
–Mum, I have been admitted into Hong Kong University.--Well done! ____________.
You ____ television. Why not do something more active?
I couldn’t do my homework with all that noise .
Your hand is dirty. It needs ____________.
After the new equipment was introduced, they produced ______machines this year as the year before.