In the study of modern science, there are many cases _____ soldiers can teach officers．
| A．when | B．who | C．which | D．where |
We are taught that a business letter should be written in a formal style _____ in a personal one.
| A．rather than | B．other than |
| C．better than | D．less than |
Maria has written two novels, both of ________ have been made into television series.
| A．them | B．that |
| C．which | D．what |
Living in the central Australian desert has its problems, _____ obtaining water is not the least.
| A．of which | B．for what |
| C．as | D．whose |
Who would you rather the report instead of you?
| A．have write | B．have to write |
| C．to have write | D．to have written |
They lost their way in the forest, and ___ made matters worse was that night began to fall.
| A．it | B．which | C．that | D．what |