I won’t leave the classroom until my homework ______.
—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.was B.were C.is