It is not always easy for the public to see _______ use a new invention can be of to human life.
| A．whose | B．which | C．that | D．what |
Although I admire you _____ your work on soil, I think you should apologize _____the villagers for the water pollution.
| A．for; to | B．to; for | C．for; for | D．to; to |
With ____ leaves ____ in the earth every year, the soil becomes richer and richer.
| A．falling; burying | B．fallen; buried |
| C．fallen; burying | D．falling; buried |
American women usually consider their best friends as someone ________ they can turn when in trouble.
| A．to which | B．on whom | C．to whom | D．with whom |
He is always serious and doesn’t like _____.
| A．play jokes | B．being played jokes on |
| C．being played jokes | D．to play joke on others |
No one knows when such a custom first _____.
| A．came into power | B．came into being |
| C．came true | D．came out |