—Why does the lake smell terrible?
—Because large quantities of water .
| A．have polluted | B．have been polluted |
| C．is being polluted | D．has been polluted |
In my opinion, obviously, night-time is when children can begin to learn to feel confident ______, without being dependent on anyone else.
| A．by their own | B．on their own | C．with their own | D．to their own |
The problem is _____ difficult for me _____ solve.
| A．so; to | B．quite; to | C．too; to | D．very; to |
Peter had ______ his career in law to become a teacher.
| A．given up | B．given in | C．given off | D．given away |
It is known to us all that the People’s Republic of China ______ on October 1, 1949.
| A．was founded | B．was found | C．founded | D．is found |
______jobs will be lost if the company closes down.
| A．Hundred of | B．Five hundred of | C．Hundreds of | D．Five hundreds of |