It was in the lab ______ was taken charge of by Professor Harris _______ they did the experiment.
| A．which, that | B．that, where | C．whom, that | D．which, where |
The chairman thought necessary to invite Professor Smith to speak at the meeting.
| A．that | B．this | C．it | D．which |
The ability _____ an idea is as important as the idea itself
| A．to express | B．expressed | C．expressing | D．to cover |
—What do you think we can do for our aged parents?
—You ____ do anything except to be with them and be yourself.
| A．oughtn’t to | B．don’t have to | C．mustn’t | D．can’t |
— Have you got any particular plans for the coming holiday?
— Yes, _____, I’m going to visit some homes for the old in the city.
| A．If ever | B．If busy | C．If anything | D．If possible |
Eye doctors suggest that a child’s first eye exam____at the age of six months old.
| A．was | B．be | C．were | D．is |