20. His sister left home in 1998, and______since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |
He is such a lazy man _______ nobody wants to work with ______.
| A．that; / | B．as; him | C．whom; him | D．as; / |
The car _______ on half way so we had to walk to school.
| A．broke up | B．broke out | C．broke off | D．broke down |
The company was willing to provide us with what we needed, _____ made us excited.
| A．what | B．it | C．which | D．that |
When I said that some people are stupid I was not _______ you.
| A．talking to | B．referring to | C．turning to | D．listening to |
As is known to all, oranges are _______ Vitamin C.
A. rich in B. poor with C. short of D. good for