________energy, we turn off the lights for Earth Hour on the last Saturday in March
| A．Saving | B．To save | C．Saved | D．Having saved |
The book is written in _____easy English _____beginners can understand.
| A．so; that | B．such; that | C．so; as | D．such; as |
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 |