______ the blind wandering through the traffic, motorists would have to step on their brakes at once.
| A．Seeing | B．Having seen | C． Seen | D．To have seen |
_____ people who buy IBM PC686 is larger than ever before.
| A．A lot of | B．A number of |
| C．A great many | D．The number of |
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 |