With prices _____ so much, it's hard for the company to plan a budget.
| A．fluctuating | B．waving | C．swinging | D．vibrating |
Help others whenever you can _______ you will earn respect from others without difficulty.
| A．and | B．or | C．unless | D．but |
The Internet celebrated its birthday on September 2nd, by which time 40 years _______ since the first successful transfer of data between two computers.
| A．has passed | B．had passed | C．passed | D．have passed |
—— I haven’t seen Johnson these days.
—— I think she _______ a conference in Beijing, but I’m not sure.
| A．should be attending | B．might be attending |
| C．could have attended | D．must have attended |
The use of Chinese by teachers in ______ English classroom must be restricted because it will decrease _______ time when students are exposed to the English language.
| A．the; / | B．an; / | C．/; the | D．an; the |
You can take ____ you like here.
| A．which | B．no matter what |
| C．whatever | D．anything of which |