The past 30 years has ______ the great changes that have taken place in China.

In the country guests tend to feel they are not highly __________ if the invitation to a dinner party is given only three or four days before the party date.

It is widely acknowledged that students should be   in terms of overall quality.

With economy developing at great speed, our city has _____ quite a few changes in recent years.

 She is a well­known doctor now, but she ________ as a cleaner at the hospital for five years.