You can’t imagine what great trouble they have _____ the problem _____.
| A．to solve; being talked about | B．solving; discussing |
| C．to solve; to talk about | D．solving; being discussed |
While he was investigating ways t improve the telescope Newton made _______discovery which completely changed ____ man’s understanding of color.
| A．a ,/ | B．a ,the | C．/, the | D．the ,a |
The most important thing about cotton in history is ___part that it played in ____Industrial Revolution.
| A．/,/ | B．the,/ | C．the , the | D．a ,the |
When he left _____college ,he got a job as ______reporter in a newspaper office .
A. /, a B /, the C .a the D .the, the
___on-going division between English –speaking Canadians and French-speaking Canadians is _______major concern of the country.
| A．The ,/ | B．The ,a | C．An ,the | D．An,/ |
If you buy more than ten, they will knock20pence off________.
| A．a price | B．price | C．the price | D．prices |