I didn’t manage to do it______you explained how.
| A．until | B．unless | C．when | D．before |
.Don’t stop______you meet with a word you don’t understand.
| A．at that time | B．each time |
| C．sometimes | D．when every time |
The thought ______he might be a scientist some day encouraged him to study hard.
| A．whether | B．that | C．how | D．why |
China's GDP grew by 7.1 percent in the first half of this year, _______ proved its proactive macro-economic policies were effective
| A．it | B．that | C．what | D．which |
You can’t shut your eyes to the fact ______more than 20% of American Families now live below the poverty line.
| A．what | B．which | C．/ | D．that |
---You seem to have had that car for years.
---Yes, I should sell it ________ it still runs.
| A．before | B．during | C．until | D．while |
Americans _________sent a message to the world________ we have never been a collection of Red States and Blue States: we are, and always will be, the United States of America.
| A．that, \ | B．who, that | C．who, when | D．that, what |
It was not ________ the many blows he received ________ the lack of fighting spirit________ led to his losing the game.
| A．so; for; which | B．so much; as; that |
| C．like; for; that | D．as; as; which |
It was only after he had spent several nights digging around the cross ________ he decided to write to Kit Williams to find out if he was wasting his time there.
| A．that | B．how | C．and which | D．what |
—The map will be of help?
—Take it with you_________you get lost in the forest.
| A．so that | B．even if | C．as long as | D．in case |
– Unfortunately, I won’t have time to visit the World Expo 2010 _____ I’m in Shanghai.
– What a great pity!
| A． until | B．since | C．while | D．unless |
---When did you see the bird last night?
---It was at about ten thirty ______ I got home.
| A．before | B．when | C．that | D．until |
I was just about to go out last night ______ the telephone rang.
| A．while | B．when | C．as | D．before |
The car crashed into the back of a truck and the driver was trapped for about an
hour being taken to hospital.
| A．when | B．before | C．after | D．until |
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