Programmes, ______ to bring the old and the young together, are growing in popularity all over the world．

---- I was warned to keep quiet about the case on court unless _______.---- So you mean you will do everything _______ then?

Mary is often heard ________ playing piano in the next room in the evening.

_____ to drive after drinking, some drivers are still trying their luck, which is dangerous. 

       __on a chair, he read an interesting storybook.