Exercise 6. Put one of the following words in each of the spaces below, to, in, behind, during, at, on (a) We sat ______the stalls. (b) The usherette showed us _____ our seats. (c) There were two actors ______ the stage. (d) You'd better ask _______ the box office. (e) My favourite actress was _______ the play. (f) During the performance, work is going on _______ the scenes. (g) People usually have a drink or a cigarette ______the interval. (h) Our seats were ______the third row. (i) He prefers to sit ______the front; she likes to be ______the back