Your room is very untidy. Please________ your things, Mike.—OK, Mum. I will do it at once.

Fifty dollars for such a T-shirt! You _______ be joking!—I’m serious．It’s made of silk.

If we _____ nothing, there _____ fewer and fewer tigersin the world. [ ]

Which girl is your sister? —- The girl ___________is wearing dark glasses.

________ are your grandparents?— They’re very well.