Their cheerful voices showed that they were having a discussion.
| A．noisy | B．friendly | C．serious | D．nervous |
Noise is unpleasant, _____ when you are trying to sleep．
| A．especially | B．specially |
| C．extremely | D．naturally |
So hard-working _____ that he sets a good example to all the other classmates．
| A．he is | B．is he | C．does he | D．he does |
With more and more forests _____, many animals are facing the danger of dying out．
| A．to destroy | B．destroying |
| C．destroyed | D．to be destoyed |
As we all know, China is a developing country, _____ attracting more and more foreigners．
| A．the one | B．one | C．it | D．that |
The beautiful town, _____ we spent our summer vacation last year , lies at the foot of a mountain．
| A．whose | B．which | C．where | D．why |