.---How much do you know about the 3D film technology？
----A little , not until ____the hot movie Avata_____some about it.
| A．did I see, did I begin to learn | B．I saw ,I began to learn |
| C．I saw, did I begin to learn | D．did I see, I began to learn |
____is certain is ___prevention is more important than treatment .
| A．It;that | B．What;that | C．As;what | D．What;what |
Of one thing I am certain _____ hard work contributes to good results.
| A．as | B．what | C．which | D．that |
Being a good listener is a kind of quality and that’s ___ it takes to keep friendship.
| A．how | B．what | C．which | D．where |
Does it make any difference __________ he refuses or accepts the invitation?
| A．whether | B．which | C．if | D．that |
---Will you please stop that ? I’m doing my homework.
---I don’t see____it bothers you.
| A．how | B．what | C．if | D．where |