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