Measures have been taken to prevent accidents, but much ______ for more improvement.
| A．remains to be done | B．is remained to do |
| C．remains to do | D．is remained to be done |
――Look! Somebody ____the sofa..
――Well, it wasn’t me. I didn’t do it.
| A．is cleaning |
| B．was cleaning |
| C．has cleaned |
| D．had cleaned |
It suddenly occurred to him___ he had left his keys in the office.
| A．whether ; |
| B．where |
| C．which |
| D．that |
The Smiths don’t usually like staying at __ hotel, but last summer they spent a few days at a very nice hotel by ___sea.
| A．/： a |
| B．the； the |
| C．/； the ^ |
| D．the；a |
There .
| A．come they |
| B．they come |
| C．they are come |
| D．they will come |
the plane.
| A．Flew down |
| B．Down flew |
| C．Down was flying |
| D．Down fly |