Smoking pollutes air. You ______ smoke here.

----Carol Walker didn’t turn up last time ,did she ? ----No .She _______.We had changed our plan .

—Sorry，Mum, I lost my key to the bicycle again． —Oh! How_____ you be so careless! You have to learn to look after your belongings．

 _____ you have the chance to go to the university in the future, you must take it.

Malaysia Airlines Flight 370 ___________ course and turned back toward Kuala Lumpur -- but there were no indications from the pilot that he was doing so.