Her parents’ quarreling with each other ____________led to her family’s breaking up.
| A．strictly | B．hardly | C．constantly | D．occasionally |
Many a teacher and many a student __________ it with __________ own eyes.
| A．has seen; his | B．has seen; their |
| C．have seen; his | D．have seen; their |
It is known to us all that the People's Republic of China __________ on October 1，1949.
| A．was founded | B．was found |
| C．is founded | D．is found |
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 |