---Would you like to go out to play football with me?--- ________, but I should finish my homework first.
In our school library there a number of books on science and the number of them growing larger and larger.
—Which is the biggest number of the four?— .
His father and mother often argue _______ what TV programmes _________.
---Can I get you a cup of coffee? ---_____________.
---It was ___________ who helped us out of danger.---What brave and helpful children! We should learn from them.