_________ worries me the way he keeps changing his mind.
| A．This | B．That | C．What | D．It |
By now, when one makes a large purchase, he should have ___ opportunity to change his mind.
| A．accurate | B．urgent | C．special | D．adequate |
It is a long time ___
| A．when I saw you last | B．since l saw you last |
| C．for I saw you last | D．then I saw you last |
Sam _______some knowledge of the computer just by watching others working on it.
| A．brought up | B．looked up | C．picked up | D．set up |
A World Without Thieves is ________wonderful film, in which Liu Dehua plays _______part of Whang Bo.
| A．the, a | B．the, the | C．a, a | D．a, the |
The book is very valuable to us. That is to say, The book is of________.
| A．very value | B．great valuable | C．great value | D．much valuable |