．—______ I lock the lab before I go home—Don’t bother．I’llcheck it myself later．

You should have thanked the hostess before leaving—I meant ________But I couldn’t find her when I was leaving

ept his head _____ water when hebegan to learn swimming, but he raised his head now and then

You’ve given us a wonderful Chinese dinner, Mrs.Wang.— ________.

He failed in the exam not only his laziness but also he didn’t listen to the teacher