Children’s brains can’t develop properly_______ they lack protein(蛋白质).
| A．when | B．since | C．because | D．unless |
After many failures the most difficult ______ is how to keep our strength up and fight again.
| A．chance | B．change | C．challenge | D．challenger |
Our life is becoming better and better, while in some countries there are still some people ______ from hunger.
| A．suffer | B．suffered | C．being suffered | D．suffering |
I like to have some coffee and ______ piece of bread in ______ cafe where I usually go.
| A．a; the | B．不填; the | C．a; 不填 | D．不填; a |
—What’s that terrible noise over there?
—The workers ______ the boxes from the back of the truck.
| A．have carried | B．are carrying | C．carry | D．will carry |
The jacket was ______ from 50 dollars ______ 33 dollars.
A. volunteered; for B. switched; on C. complained; about D reduced; to