I can’t find my English book. I must ___ it at home this morning.
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.
She _____ to the office than she got down to writing the report.
He _____ articles for our wall-newspaper these three years, and he _____ about forty articles.
— Look at the black clouds. It ____ soon. — Sure. If only we ____ out.
The children ____ very quiet;I wonder what they ____ up to.