___ from space, our earth, _____with water 70% of its surface, appears as a “blue planet”.

A. Seeing, covering 　　　　　　　 B. Having seen, covered

C. To see, covered 　　　　　　　　　 D. Seen, covering

Don’t all speak at once! _____, please.

　 A. Each at one time 　 B. one by one time

　 C. one for each time 　 D. One at a time

One may never know the ________ of knowledge without being educated.

A．power　　 　　　 B．force

C．energy　 　　　　　　 D．strength

Now many people move into cities in order to have their children___.

A. better educate       

B. receive well education  

 C. better educated 

 D. accept better education

The danger of heart disease increases　　 20% for one hour a day spent watching televsion.

A. for B.to C.in D.by

China has become the third country _________________.(把载人宇宙飞船发送到太空) (send up into)

The young man couldn’t afford a new car. _______, he bought a used one.

A. Besides　　　　　　 B. Otherwise　　　　 C. Instead　　 D. Still

My brother _____ while he _____ his bike and hurt himself.

　 A. fell; was riding 　 B. was breaking; was playing

　 C. broke; wa playing 　 D. was playing; broke

John and Jenny are of the same age,but John is taller　　　 a head.

A、than　　 B、with　 C、by　　　 D、over