The computer center, ________ last year, is very popular among the students in this school.
| A．open | B．opening | C．have opened | D．opened |
---Where did you see the sponsor, Madame?
---It was in the supermarket __________I was doing some shopping with my husband.
| A．that | B．where | C．which | D．when |
The time he has devoted in the past years ________ the disabled is now considered _______of great value.
| A．to help; being | B．to help; to be | C．to helping; to be | D．helping; / |
It will be quite a long time _______ she is back again, so don’t be too cross with her.
| A．before | B．since | C．that | D．until |
－What does the sign over there say?
－“No person _______ bring drinks into the student computer pool.”
| A．will | B．shall | C．may | D．must |
Traffic conditions in Beijing ________ for decades. At first people only complained about jams during rush hours，but today every hour is rush hour.
| A．is worsening | B．have worsened |
| C．worsened | D．have been worsening |