He made a mistake, but he corrected the situation __________ it got worse.
| A．until | B．when | C．before | D．as |
The students competed _____the honor of winning _____each other _____the school sports meet.
| A．in ;with;against | B．against;for;at | C．for;against;in | D．about;in;with |
We tried to _________his doubts and let him tell the truth.
| A．replace | B．remove | C．review | D．rebuild |
The police ________him to see if he had a gun.
| A．searched | B．searched for | C．in search of | D．looked for |
Is this museum _______some German friends visited the day before yesterday?
| A．which | B．that | C．where | D．the one |
The visitors saw rows of houses the roofs _______are red.
| A．where | B．that | C．what | D．of which |