People who are infected with HIV are often looked down upon because social _____ against the disease runs so deep.
| A．preference | B．conflict | C．prejudice | D．status |
The basketball match was held from December 5th to 30th, during ________ time as many as 27 teams competed for the championship.
| A．whose | B．when | C．which | D．that |
If he had not joined the army, he ________ alive now.
| A．would be | B．will be |
| C．would have been | D．is |
He is really nervous. He ________ back and forth all the night waiting for the results.
| A．walked | B．had walked |
| C．has been walking | D．walks |
It was because we went on separate ways ________ I felt relieved.
| A．that | B．when | C．how | D．which |
The teacher taught us to find a planet in the solar system in his last lesson, ________ everything through jokes.
| A．having explained | B．explained |
| C．to explain | D．explaining |