Shanghai is really a modern city now! Many tall buildings ________everywhere.
| A．can be seen | B．can see |
| C．should be seen | D．should see |
How unlucky he was! A car accident ________ to him last week.
| A．was happened | B．had happened |
| C．happened | D．was happening |
Both his parents look sad. Maybe they ________ what happened to him.
| A．will know | B．knew |
| C．have known | D．had known |
—I'm sorry to have kept you waiting.
—Oh, not at all. I ________here only a few minutes.
| A．have been | B．had been | C．was | D．will be |
Don't bother him. He ________to the weather report. He is leaving for another city.
| A．will listen | B．is listening |
| C．listens | D．listened |