We laugh at jokes, but seldom _____ about how they work.
| A．we think | B．think we |
| C．we do think | D．do we think |
I couldn’t help but_____very concerned about his illness when I heard he was in hospital because of heart disease.
| A．to feel | B．feel | C．feeling | D．to have felt |
The science of computer, _____rapid progress has been made in recent years, is the most important of all science.
| A．to which | B．in which | C．of which | D．from which |
Parents complain their children are behaving unreasonably _____children consider their parents to be old-fashioned.
| A．while | B．when | C．or | D．after |
It suddenly_____ to me that I could use a computer to do the job.
| A．erupted | B．caused | C．occurred | D．happened |
Knowledge learnt from books doesn’t have the same effect on a child
as_____through practice.
| A．those | B．one | C．it | D．that |