If you haven’t got the service advertised on their website, they you have _____ to complain about it.
A．choice B．purpose C．right D．reason
The manager listened to the customers’ complaints attentively with great patience, _____ to miss any point.
A．not trying B．trying not C．to try not D．not to try
Never should we forget the war and sufferings _____ caused to the people.
A．it B．which C．that D．what
As soon as his teacher begins lecturing, he begins to doze off, not intentionally but _____.
A．personally B．randomly C．habitually D．unconditionally
The Chinese lunar New Year usually _____ two records: the world's most watched television gala show, and its busiest telecommunications network.
A．develops B．witnesses C．establishes D．launches
Nowadays certain limit should be set on use of cars to reduce air pollution.
A．/; the B．a; the C．the; / D．the; the
