People often find themselves caught in sucha _____ as “whether…or not…”

Is Jim in the gym by himself— No. There is another boy ________ tennis with him.

More and more high－rise buildings have been builtin big cities 　　　　 space.

Will you be available at three o’clocktomorrow afternoon – No. I ______ a lecture then.

Many girls are _____ in singing and dancing.