—Have you finished your work？
—No，not yet．I think it’ll take________two hours．
| A．other |
| B．else |
| C．the other |
| D．another |
The task is so hard for
e . I don’t know _______________.
| A．what I can do | B．how to do | C．what to do | D．both A and C |
Good books help us ___________ a whole new world to me .
| A．turn up | B．look up | C．get up | D．open up |
There is no air _______ water on the moon .
| A．and | B．but | C．or | D．with |
They don’t know what ___________ the problem .
| A．to do | B．do | C．to do with | D．do with |
Don’t try to do everything at once. Take it a bit _______________.
| A．at times | B．at a time |
| C．at all times | D．at that time |