From space, the earth looks blue. This is about seventy-one percent of its surface is covered by water.
| A．why | B．how | C．because | D．whether |
What a poor boy!He was born with __________ his backbone.
| A．wrong on | B．fault on | C．a wrong in | D．a fault in |
He moved to a big city to try his __________.
| A．luck | B．courage | C．success | D．taste |
You can only tell the news to Tom,Jack and Bill,and __________ it should be kept.
| A．among them | B．among whom | C．between them | D．between whom |
I’m afraid none of us can __________ the machine that has been imported from abroad.Which of the following is wrong?
| A．work | B．run | C．turn | D．operate |
In Britain,sales of cigarettes have been reduced __________ 30% in the past ten years.
| A．for | B．to | C．from | D．by |