--- It’s said that scientists have ________ a way to deal with Influenza A/HiN1.--- Really? That’s great!
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.