— Who are those people gathering in front of the building?
— A group __________ itself the youth volunteers.
| A．calling | B．calls | C．called | D．to be called |
Effective measures have been taken to prevent _______pollution.
| A．exhausted gas | B．exhausting gas |
| C．exhaust gas | D．exhaustion gas |
It worried her a bit ____ her hair was turning grey.
| A．while | B．that | C．if | D．for |
_______you come or not is up to you.
| A．What | B．If | C．Why | D．Whether |
_________is going to do the job will be decided by the Party committee.
| A．That | B．Why | C．How | D．Who |
____ we can't get seems better than ____ we have.
| A．What, what | B．What, that |
| C．That, that | D．That, what |