Peter, can you tell me _____—-He used to be short,but now he is tall and heavy.

driving used to occur _______, butnow it is under control.

Many festivals are held _______ our ancestors for their contribution to the world

There _____a very small number of books on science in our school library, and in these years the number of them growing larger and larger.

few years, the coal workers theirlungs X-rayed to ensure their health.