As a matter of fact, scientists discovered no ______ of life in the Mars.
A. signal B. mark C. sign D. symbol
They put forward a lot of plans at the meeting, none of ______were carried out in their work.
A. which B. them C. that D. what
We ______the difficulty together, but why didn’t you call me?
A. should face B. might face
C. must have faced D. might have faced
_____ the Internet is making people closer, it may also be breaking some homes or will cause other family problems.
A. When B. If C. As D. While
At the end of the meeting, it was announced that an agreement ______.
A. has reached B. had reached
C. has been reached D. had been reached
Young children should be ______to be honest and happy.
A. brought out B. brought up
C. brought in D. brought down
