----Where________your rulers?----________are in the pencil-box.
—My CD player doesn’t work. —_______. Maybe I can help you.
He won the first prize in the competition and we were _______ him.
Our teacher walked into the classroom _______ a smile _______ his face.
—Hello, may I speak to Mr. Li? —Oh, sorry! He__________to Hong Kong. He will come back in three days.
Some students often find _______ difficult _______ remember the English words.