The astronauts found that ______ the spaceship went further and further into space, it became more and more difficult to control its own movements.
| A．if | B．till | C．as | D．while |
Two or three years ago this kind of glasses _______ a favorite for some time, but now it _______.
| A．were, has gone over | B．was, has gone out |
| C．was, has gone away | D．were, is going down |
I’m surprised to see you are a chain smoker. You _______ , I remember.
| A．didn’t use to be | B．mustn’t | C．used not to | D．didn’t have to |
After ten years of hard work, the Browns _______ all their debts.
| A．satisfied | B．met | C．paid | D．took |
_______ is known to us is that time is limited and precious.
| A．What | B．That | C．It | D．As |
―Can you finish the reports today?
―Sure. I’ve ____________ half of them already.
| A．got away from | B．got down to | C．got around | D．got through |