—Do you think I should accept his invitation，Jim?
— ．If I were you．I certainly would．
| A．None of your business． | B．It depends． |
| C．Why not? | D．I don't think so． |
The novelist knew little about the precious document(文件). _____, he had hardly heard of it before.
| A．Instead | B．Therefore |
| C．Actually | D．However |
Scientists and doctors across the world have done _____ research over the years, hoping to find a cure for cancer.
| A．a great deal of | B．quantity of |
| C．quite a few | D．a large number of |
I don’t think _________ possible to master a foreign language without much memory work.
| A．this | B．that | C．its | D．it |
She has already tried her best. Please don’t be too ______ about her job.
| A．special | B．responsible |
| C．unusual | D．particular |
Food safety _____ to customers, which should be the minimum requirement for the food industry.
| A．guarantees | B．is guaranteed |
| C．is guaranteeing | D．guaranteed |