20 . They have made_______a rule________in the room.
| A． this; not to smoke | B． it; smoking |
| C． it; to not smoke | D． it; not to smoke |
He was late for the meeting because the bus he took ______ halfway.
| A．broke in | B．broke down | C．broke out | D．broke up |
Most of the big hotels in Shanghai were full last week, But finally we ______find a room in a small one.
| A．ought to | B．could | C．were able to | D．might |
Tom has been out of work for two years, so he has difficulty______.
| A．earning living | B．earning his living | C．to earn livings | D．to earn his living |
This is one of the few best films ______ highly thought of by the public.
| A．which is | B．that are | C．that is | D．which are |
After living in the city for 10 years he returned to the small village ______ he grew up as a child.
| A．which | B．where | C．that | D．when |