The retired professor, _____ in his new book in the past three years, hasn’t realized the decline in his health．
| A．involved | B．being involved |
| C．having involved | D．to be involved |
The poor boy is in danger. We should do all we _____ help him out.
| A．can do | B．can to | C．can to do | D．can |
Nobody but you _____ able to sing that American song.
| A．are | B．were | C．is | D．can be |
-----Have you _____ everything ready for the meeting?
----- Not yet, we need ______.
| A．got; another three chairs | B．got; more three chars |
| C．prepared; other three chairs | D．prepared; three another chairs |
It is he, not you, _____ right.
| A．who are | B．who is | C．which is | D．that are |
Those _____ know the answer put up your hands.
| A．who | B．which | C．that | D．whom |