________you never plan to visit the polar bears in the North Pole or the penguins in the South Pole，now it is the proper time to start thinking about that.
| A．Until | B．Unless | C．As long as | D．Even if |
_______, the dancers practise hard to make their dreams come true.
| A．Instead of being disabled | B．Being disabled |
| C．Disabled as they are | D．In case of being disabled |
"We can not afford limited progress. We need rapid progress," Ban said at the Third World Climate Conference in Geneva, by the World Meteorological Organization (WMO).
| A．organized | B．being organized | C．organizing | D．was organized |
-- Alison, I’m sorry. I can’t come to the wedding with you tomorrow morning. -- ________?
-- My grandma was severely ill, so I have to stay in the hospital to look after her.
| A．How is it | B．How come | C．So what | D．What’s the problem |
Double ovens are a good idea, especially ________ you are cooking several meals at a time.
| A．though | B．if | C．that | D．unless |
I know a little bit about the city as I __________ there for one year in my youth.
| A．am studying | B．had studied | C．studied | D．have studied |