—How much shall I pay for the food?—You .This is free of charge.
We should do ___ the teacher told us.
The number of the people in the world ______ growing faster and faster. A. is b. are C. have D. were
I’m sorry to have kept you ________ for a long time. A. wait b. to wait c. waiting D. to be waiting
The film __________ for ten minutes when we got to the cinema.
Three years ____ a long time for us students.