He began to take political science ________ only when he left school.(2013·湖北)
He ______ articles for our wall-newspaper these three years, and he ______ about forty articles.
--- ______ Betty this morning? --- Not yet, but she is sure to be here before noon.
--- Is Tom still smoking? --- No. By next Saturday he ______ for a whole month without smoking a single cigarette.
The vegetables didn’t taste very good. They ______ too long.
I used to drink a lot of tea but these days I ______ coffee.