Perhaps it is true that nobody in the world knows exactly how the earth __________.
| A．came up | B．came out |
| C．came to power | D．came into being |
.-- It’s no easy task to catch a ticket on a website that receives 1 billion clicks daily .
--I can’t agree with you more . There _____ be errors for every single step .
| A．should | B．must | C．can | D．will |
We are in great need of a more capable monitor , ______ with straightforward personality as well as good humor .
A. who B the one C. one D. which
Parents and children should communicate more to _____ the gap between them so that they can understand each other better.
| A．open | B．narrow | C．widen | D．leave |
We are now enjoying the cool air in the room . _____ ，the farmers are harvesting crops in the hot sun .
| A．Therefore | B．Besides |
| C．As a result | D．In the meanwhile |
We can see many examples in our life _____ positive thinking changes a person completely.
| A．which | B．that | C．where | D．while |