What shall I do with the medicine—The instructions _______ that you should take threepills a day.

Your uncle speaks good English. Who taught him– ________, he learned it by himself.

_____ to nuclear radiation, even for a short time, may produce variants (变异体) of genes in human bodies.

You’dbetter go there by train. The train ticket is ________ the plane ticket.

Where did you getto know her — It was on thefarm _________ we worked