David and Susan didn’t give in to each other, so they _________ the whole time they were together.
| A．have quarrelled | B．had quarrelled |
| C．were quarrelling | D．had been quarrelling |
The 29th Olympic Games ____ in Beijing in 2008.
| A．will be held | B．was held | C．has been held | D．is being held |
—Did you visit the museum today?
—No. We _____ it, but we spent too much time shopping.
| A．could have visited | B．must have visited | C．could visit | D．must visit |
The school is _____ a Chinese teacher for the new term who masters the English language perfectly.
| A．searching | B．in the search of | C．in search | D．in search of |
He is always helping people without expecting anything _____.
| A．in common | B．in turn | C．in danger | D．in return |
It is known to us that lions and tigers _____ the cat family.
| A．are belonging to | B．belonged to | C．belong to | D．are belonged to |