How dirty the windows are! They really require _______.
| A．to clean | B．being cleaned | C．to have cleaned | D．cleaning |
Costs have been reduced ___20% over past year.
| A．in | B．on | C．to | D．by |
Don’t touch him, for he is a ______person.
| A．friendly | B．dangerously | C．frankly | D．dangerous |
He is a ______ traveller.
| A．addictive | B．addicted | C．addition | D．additional |
—Where will you start your work after graduation?
—Mmm, it's not been decided yet. I ____ continue my study for a higher degree.
| A．need | B．must | C．would | D．might |
I ‘m the first____ I might be wrong.
| A．to admit | B．admit | C．of admiting | D．for admitting |