Our playground is not so tidy and beautiful as before, students must ____ dirty things on it.
Get up quickly, Bill, ______ you`ll be late for school.
----Can I join the English club? ---Sure. Please show ______your school ID card.
Mike is my good friend. He is ________American boy.
—Welcome to Hechi! —____.
—Excuse me. How long can I keep the dictionary? —You canreturn it next Monday.