The cigarette end thrown away by a careless woodcutter _______ the big forest fire.
The little child ____go out alone at night, so he ____walk in the dark that night.
-We had _______really smoggy December this year.-I can’t remember _____ winter when air was polluted so severely.
To succeed as an artist, one must ________talent and discipline.
The ______ of blood made the girl feel sick and she began to cry.
—Jack, you seem in high spirits.—__________ We won the match 4-0.