_______ , I lost heart in French learning，but my father often said to me, “Keep on working
hard；you will succeed ______ ”．
| A． At a time；in time | B．At a time：on time |
| C．At one time；in time | D．At one time；on time |
This kind of cloth washes well. I think it is worth __________.
| A．buying | B．being bought |
| C．bought | D．to be bought |
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 |