Agriculture _____ about 14 percent of global greenhouse gas emissions, and transporting the food around adds to the environmental cost.
In this experiment, they are woken up several times during the night, and asked to report what they _____.
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.