.The police were trying to _____ the suspect’s motive of killing his wife.
| A．single out | B．catch on | C．stop off | D．figure out |
Along with the letter was his promise __________ he would visit me this coming Christmas.
| A．which |
| B．that |
| C．what |
| D．whether |
The idea has widely been accepted __________ man should live in harmony with nature.
| A．that |
| B．which |
| C．when |
| D．where |
There's a feeling in me __________ we'll never know what a UFO is.
| A．that |
| B．which |
| C．of which |
| D．what |
Information has been put forward __________ moremiddle school graduates will be admitted into universities.
| A．while |
| B．that |
| C．when |
| D．as |
Clinical evidence began to __________, suggesting that the new drugs had a wider range of useful activities than had been predicted from experiments in animals.
| A．operate |
| B．strengthen |
| C．approve |
| D．Accumulate |