1 . Citizens of higher social classes ________ (permit)to live closer to the center of the circles. （所给词的适当形式填空）

2 . Amy, as well as her brothers, ________ (give) a warm welcome when returning to the village last week. (所给词的适当形式填空)

3 . A number of experts ________ (invite) to attend the meeting last week. (所给词的适当形式填空)

4 . Early this morning, bright lights ________ (see) in the sky outside the city. (所给词的适当形式填空)

5 . Inca builders cut stones to exact sizes so that nothing ________ (need)to hold walls together other than the perfect fit of the stones. (所给词的适当形式填空)

6 . When the car stopped in the town square, it ________ (surround) by soldiers immediately. (所给词的适当形式填空)

7 . Steam engines ________ (use) to pull the carriages and it must have been fairly unpleasant for the passengers, with all the smoke and noise. (所给词的适当形式填空)

8 . As they ________ (give) an invitation to appear live on BBC, the Beatles quickly became famous in Britain with nationwide tours. (所给词的适当形式填空)

9 . There, they ________ (welcome) to the Chinese style compound where they were to live. (所给词的适当形式填空)

10 . Only 60 percent of the work________(be) done yesterday. (所给词的适当形式填空)