They experimented _____the new medicine _____anima
ls．
A．on; to B by ; on C．with ; on D with; to
He has been _______ for three weeks. We’d
better find another person to fill his place.
| A．absent | B．left | C．gone | D．resigned |
. Is this school _______ some German friends visited last week?
| A．the one | B．where | C．that | D．which |
I have to turn to my teacher for help, because this math problem is rather difficult______.
| A．worked out | B．to be worked out | C．working out | D．to work out |
They desired that they __________ the right to attend the meeting.
| A．had | B．have | C．has | D．were |
They talked a lot about the things and persons ________they saw in the Vancouver Winter Olympics.
| A．which | B．that | C．whom | D．what |