When deeply absorbed in work, _____ he often was, he would forget all about eating or sleeping.
| A．that | B．which | C．where | D．when |
________number of people who own luxury cars is on ________increase every year.
| A．A; the | B．A; an | C．The; the | D．The; an |
From what I learn about their hotel, the service and the weather, they ___ their holiday very much.
| A．wouldn’t have enjoyed | B．shouldn’t have enjoyed |
| C．needn’t have enjoyed | D．can’t have enjoyed |
Just after putting away the dishes, _______.
| A．the doorbell was rung | B．mother heard the doorbell ring |
| C．someone knocked at the door | D．the doorbell rang loud |
Don’t you think it ____ surprise that ____ German can’t speak ___ German language?
| A．/; the; / | B．a; a; the | C．/; a; the | D．a; a; / |
He made another wonderful discovery, ____ of great importance to science.
| A．which I think is | B．which I think it is | C．which I think it | D．I think which is |