_________ English can be difficult to learn, it is a very useful tool for communication.
A. As B. When
C. While D. Because
Years of hard work almost made him ________________.
A. break up B. break out
C. break down D. break off
—What would you like to do next? Go skating?
—Well，______ . I am not so skilled at it. I hate to be black and blue all over.
A．That’s the last thing I’ll do．
B．It’s up to you
C．I can’t agree more．
D．You can say that again!
Crops died of drought for ____________ water.
A. lack B. lacking of
C. a lack D. lack of
It’s wise to handle the ____________ between nations in a peaceful way.
A. condition B. control
C. confusion D. conflict
I think it a little __________ to finish so much work within 30 minutes.
A. challenging B. challenge
C. challenged D. challengingly
