My sister ______ goes to bed early because she needs a lot of sleep every day.
—Who cleaned the classroom yesterday?—Kevin ________,I think.
—________ did she do last night?—She studied math(数学).
—When ________ Jessy ________ to New York?—Yesterday.
—When ________ you ________ to learn to skate?—Five years ago.
Ten minutes ago,there ________ an eraser,a pen and some books on the desk.A.wasB.wereC.is