My sister _______ late for school yesterday.A. was B. were C. is
--______ do you stay up late? -- Never. I always go to bed early.
--_____ did Dave go on vacation? -- He went to the mountains.
—Thanks for your help,Mary! —________.
—_________ are these trousers? —The trousers on the bed? They are only $15.
—Who ______ P.E? —Sam _______.