The biggest whale is ___ blue whale, which grows to be about 29 meters long—the height of _____ 9-story building.
| A．the; the | B．a; a | C．a; the | D．the; a |
The managers discussed the plan that they would like to see _____ next year.
| A．carry out | B．carrying out | C．carried out | D．to carry out |
Don't scold him; even an experienced engineer _____ make such a mistake after all.
| A．must | B．can | C．should | D．dare |
A survey of the opinions of scientists _____ that three hours of outdoor exercise a week _____
good for our health.
| A．show; are | B．shows; is | C．show; is | D．shows; are |
It was last year _____ I visited the museum _____ you had visited.
| A．that; that | B．when, where | C．that; where | D．when; that |
______ when to leave, I could only stay at home, _____ nothing.
| A．Knowing not; done | B．Not knowing; doing |
| C．Having not known; done | D．Not having known; doing |