You will never know the result ______ you try it by yourself.
—Have a nice weekend! —________.
—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.