_______ difficult and challenging the task may be, we must finish it on time, because there is a possibility _______our work will go down in history.
| A.Whatever; that | B.However; as |
| C.Whatever; which | D.However; that |
Both rice and wheat _____ grown in our country.
| A.is |
| B.are |
| C.was |
| D.were |
Mathematics _______ the language of science.
| A.are |
| B.are going to be |
| C.is |
| D.is to be |
Stories of the Long March _______ popular with the young people now.
| A.is |
| B.was |
| C.are |
| D.were |
Three million tons of coal ______ every year in the city.
| A.is exploited |
| B.are exploited |
| C.had exploited |
| D.have exploited |
There _____ a lot of rubbish on the floor so I asked Mary to sweep _____ up.
| A.were; it |
| B.are; them |
| C.was; it |
| D.is; them |