You won’t pass the exam _____ you don’t work hard.
A.but | B.so | C.and | D.if |
Scientists are trying their best to_______ ways to treat the terrible disease caused by Ebola(埃博拉).
A.come up with | B.look forward to |
C.talk about | D.give up |
—What shall we do this Saturday?
— it rains, we’ll have a picnic in Century Park.
A.If | B.Unless | C.Because | D.When |
It's a pity that I didn't think of ringing you .
A.earlier | B.earliest | C.early | D.the earliest |
To remember things accurately, we don't allow other thoughts our mind.
A.enter | B.to enter | C.entering | D.entered |
If you travel around the world, you will be surprised at ________.
A.how different the foreign customs are |
B.how the foreign customs are different |
C.how different are the foreign customs |
D.how are the foreign customs different |