＿＿＿used to be thought that the earth was square.
| A．He | B．What | C．It | D．That |
. People in Jiangsu Province are proud of they have achieved in the past ten years.
| A．that | B．which | C．what | D．how |
. After he graduated from college, he _______ his father’s business.
| A．took over | B．took up | C．took in | D．took on |
If we work with a strong will, we can overcome any difficulty, _______great it is.
| A．what | B．how | C．whatever | D．however |
You can not imagine the difficulty they had ____ the problem. It isn’t ____ easy.
| A．to solve; so | B．solved; so | C．solving; that | D．solved; that |
. — I didn't go to work yesterday afternoon because my car broke down.
— You ________ mine. I wasn't using it.
| A．might borrow | B．must have borrowed |
| C．could have borrowed | D．ought to borrow |