I think I should keep on the guitar at home.

How ______ is it from the railway station to the museum?

Have you ever stopped _____ how our lie_____ if the world ran out of ol

－Look，here________．－Oh，it’s my secretary.But I________him to pick me up at seven o’clock.

The traditional view is ______ we sleep because our brain is “programmed” to make us do so.