Today’s world is changing rapidly, making _____ necessary for us to continue learning otherwise we can’t keep up with the time.
| A．us | B．it | C．this | D．one |
It is the bus driver who should ______ the safety of the passengers.
| A．answer for | B．search for | C．stand for | D．go for |
I’m very grateful to my high school teachers, without ______ help I wouldn’t be so excellent.
| A．whom | B．their | C．which | D．whose |
I ______ for Shanghai this Saturday, so I want to know when the earliest plane ______.
| A．leave; takes off | B．am leaving; takes off |
| C．leave; is taking off | D．am leaving; is taking off |
He ______ it on schedule, but somehow he fell behind.
| A．must have done | B．might finish |
| C．could have finished | D．could finish |
The doctor’s dilemma was _____ he should tell the patient the truth.
| A．whether | B．which | C．that | D．what |