The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.
| A．after | B．before |
| C．since | D．when |
-- Let's go and have a good drink tonight.
-- ________ Have you got the first prize in the competition?
| A．What for? | B．Thanks a lot. |
| C．Yes, I'd like to. | D．Why not? |
Jumping out of_________ airplane at ten thousand feet is quite _________ exciting experience.
| A．x; the | B．x; an | C．an; an | D．the; the |
Once a decision has been made, all of us should _________ it.
| A．direct to | B．stick to |
| C．lead to | D．refer to |
_______ ,! have to put it away and focus my attention on study this week.
| A．However the story is amusing |
| B．No matter amusing the story is |
| C．However amusing the story is |
| D．No matter how the story is amusing |
Elephants have their own way to tell the shape of an object and _________ it is rough or smooth.
| A．不填 | B．whether | C．how | D．what |