Global warming causes the ocean ________, which in turn speeds ice melting.
A. to warm B. warming 
warmed D. warm
_________ did the students realize that they were mistaken about spiders.
| A．It was until then | B．It was not until then |
| C．Not until then | D．Not until when |
Fans from miles around crowded into the stadium for the concert of Jay Chou on September 4th, 2010, _________ are popular with teenagers.
| A．many of his songs | B．many of whose songs |
| C．many of which songs | D．and many of whose songs |
--- Can you balance your ________?
--- Sure. Low as my salary is, I can make both ends meet.
| A．expense | B．income | C．budget | D．target |
The young teacher made ________ silly mistake and out of _________respect for his feelings, I didn’t point it out in class.
| A．the; the | B．the; / | C．a; the | D．a; / |
—Putting on a happy face not only helps us make friends but also makes us feel better.
—_________.
| A．I’ m with you on that | B．I’ d love to | C．It’ s up to you | D．It’ s my pleasure |