----What ________ the number of the students in your school?      ---- About two thousand. A number of them _______ from America.

 According to my father, movies, such as the one you talked about yesterday, _____ not worth seeing. 

Don't miss the meeting. The questions to be discussed at it _____ of great importance. 

The Arabian Nights _____ well known all over the world, in which many a story_____ interesting and instructive．

Faced with a bill for $10,000, _____.