.—It is raining cats and dogs.
— ..
| A．So it is | B．So is it | C．Neither it is | D．Neither is it |
Today APEC is playing a more important role in the world stage，______ purpose is to promote economic cooperation in the Asia-Pacific area．
| A．where | B．whose | C．when | D．Which |
Ning Zetao，who won a total of four golds at the 2014 Incheon Asian Games，____ himself as a new swim star．
| A．distinguished | B．described |
| C．Represented | D．Developed |
一____it snow tomorrow，what would we do?
一In that case，we'11 have to stay at home．
| A．Will | B．Must | C．Might | D．Should |
The world is a book，and those who don’t travel read only one page．That’s____I’ll go on a tour this summer．
| A．how | B．why | C．when | D．Where |
一Excuse me，sir．This is a non-smoking train．
一Oh，sorry．I____ know that．
| A．haven’t known | B．hadn’t know |
| C．didn’t know | D．don’t know |