John, _______ university professor, is considered to be _______ success as ______ expert in the agriculture research.
| A．a; a; an | B．an; / ; an | C．the; /; an | D．a; the; an |
It is thought that Henan Shuanghui Industry Group Co., Ltd. ____take responsibility for its consumers.
| A．can | B．may | C．must | D．need |
As a student of Senior Three, he has very little free time __ he can spend developing his own interest.
| A．when | B．in which | C．at which | D．that |
Mary is always ready to do some __ work at the local geracomium（敬老院）in her spare time.
| A．responsible | B． exhausting | C．voluntary | D．professional |
Many experts stick to the view _____ teacher development is the key to the education quality.
| A．which | B．what | C．that | D．where |
When I wanted to express my thanks to him，words ___ me. I just held his hands firmly and choked.
| A．left | B．fled | C．forgot | D．failed |