Susan, ______ university student from Europe, teaches me ______ art in her spare time.
| A．an; 不填 | B．a; the | C．a; 不填 | D．an; the |
He was so____ a key university that he would work until late into the night.
| A．curious about | B．anxious about | C．desperate for | D．concerned about |
They also agree that it is the burning of more and more fossil fuels that has resulted ____ this increase in carbon dioxide.
| A．from | B．of | C．in | D．to |
____ late in the morning, Bob turned off the alarm.
| A．To sleep | B．Sleeping | C．Sleep | D．Having slept |
It is only when the disease has progressed to the AIDS ____ a person begins to look sick.
| A．which | B．what | C．who | D．that |
The warmth of ____sweater will of course be determined by the sort of ____wool used.
| A．the, the | B．the, / | C．/, the | D．/,/ |