The scientists in China are trying __________ the ways to reduce the fog and haze (减少雾霾)．
| A．look for | B．to look for |
| C．to find out | D．find out |
It was a cold winter night, and there wasn’t anyone __________the boy could turn for help in the street.
| A．that | B．which | C．whom | D．what |
___________for his good skill, this doctor has a lot of visitors calling for help all the time.
| A．Knowing | B．To know | C．Known | D．To have known |
The harder you__________, the better progress you ___________.
| A．will work | B．work; have made |
| C．work; will make | D．will work; make |
As ________matter of fact, _________ beauty of __________ nature there made an excellent impression on me.
| A．a; the; 不填 | B．a; the; the |
| C．the; the; 不填 | D．a; 不填；the |
His words remind me________ we did together in the past.
| A．that | B．of what | C．what | D．of that |