They would not allow him _______ across the enemy line.
| A．to risk going | B．risking to going | C．for risk to go | D．risk going |
The foreign guests, ____ were government officials, were warmly welcomed at the airport.
| A．most of them | B．most of that | C．most of whom | D．most of those |
This is the very letter ____came last night.
| A．who | B．which | C．that | D．as |
I know only a little about this matter; you may ask ____ knows better than I.
| A．whoever | B．whomever | C．anyone | D．the one |
This is the school ____ we visited three days ago.
| A．where | B．/ | C．when | D．what |
This is the factory ____ we worked a year ago.
| A．where | B．that | C．which | D．on which |