Nowadays people are more concerned about the environment________they live.
| A．what | B．which |
| C．when | D．where |
Keep away from such persons __________ will do you no good.
| A．as | B．that | C．like | D．who |
----Recent years have _______ rapid changes of my hometown.
----Yes, I could hardly recognize it when I arrived yesterday.
| A．watched | B．contributed | C．made | D．witnessed |
I like getting up very early in summer. The morning air is so good ___________.
| A．to be breathed | B．breathing | C．to breathe | D．being breathed |
____ the terrible weather and the possible dangers ahead in the mountains, he insisted on going there alone.
| A．Because of | B．In front of | C．Along with | D．Regardless of |
________ by the advances in technology, many farmers have set up wind farms on their land.
| A．Being encouraged | B．Encouraging | C．Encouraged | D．Having encouraged |