The insect ______ a powerful drug which affects mosquitoes.
| A．contains | B．includes | C．contained | D．included |
I like getting up very early in summer. The morning air is so good __________.
| A．to be breathed | B．to breathe |
| C．breathing | D．being breathed |
We are now faced with a new problem involved in the popularity of private cars __________ road conditions need __________.
| A．which; to be improved | B．that; to be improved |
| C．where; improved | D．when; improved |
This coastal area __________ a national wildlife reserve last year.
| A．was named | B．named |
| C．is named | D．names |
After getting lost in a storm, a member of the navy team __________ four days later.
| A．rescued | B．was rescued |
| C．has rescued | D．had been rescued |
It was reported that an agreement __________ between the two companies and that they would carry out a project together.
| A．reached | B．had been reached |
| C．was reached | D．had reached |