You’d better make your living. You can’t always ________ having good parents.

Rubbish will be made use of _______ light after thiskind of new machine is invented. [ ]

We haven’t got any coffee. Let’s have tea _______.

So you missed the lecture given by Professor Smith——-____I got there30 minutes before it finished

――How many children are there in your family ――So many there used to be, but now I am_______ an only child.