Not having finished his homework, ______ to watch TV.
When he was alive, the old scientist used to say that knowledge ____from practice and he gained his experience by doing a lot of practical work.
He ___articles for our wall-newspaper these three years, and he ___about forty articles.
The children ______ very quiet; I wonder what they ____up to.
Jim talked for about half an hour yesterday.Never_____ him talk so much.
—— _____ Betty this morning? —— Not yet, but she is sure to be here before noon.