is known to us is that tobacco contains nicotine and other harmful products，so you should give up smoking．
| A．As | B．It | C．What | D．Which |
On seeing me, he turned over and pretended _____ around in the street.
| A．to be wandered | B．to wander | C．wandering | D．to be wandering |
_____ recent survey shows that the number of Non-English speaking families in US is on ____ increase this year .
| A．The, the | B．A, an | C．A, the | D．The, an |
--Look! There is a long queue waiting for the bus. Shall we take a taxi?
--_______. It will save us a lot of time.
| A．I didn’t get it. | B．I couldn’t agree. | C．So what? | D．That’s a good point. |
_______ with the size of the whole earth, the biggest ocean does not seem big at all.
| A．Compare | B．Comparing | C．To compare | D．Compared |
--How about the book you are reading?
--Good indeed. It ______many problems we have come across in our study.
| A．contains | B．covers | C．refers | D．concentrates |