The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
| A．what | B．which | C．that | D．though |
Mark was a student at this university from 1999 to 2003, _______ he studied very hard and was made Chairman of the Students Union.
| A．during which time |
| B．for which time |
| C．during whose time |
| D．by that time |
Helen was much kinder to her youngest son than to the others, _______, of course, made the others envy him.
| A．who | B．that |
| C．what | D．which |
I saw a woman running toward me in the dark.Before I could recognize who she was, she had run back in the direction _______ she had come.
| A．of which |
| B．by which |
| C．in which |
| D．from which |
—Is he content to accept our offered price?
—Yes. He cares more about the quality. Money is _______ to him.
| A．everything | B．none |
| C．nothing | D．something |
I’d like to buy a present for my girlfriend’s birthday，_______ at a reasonable price but of great value.
| A．which | B．as |
| C．that | D．one |