Excuse me, may I ask you some questions? — Of course, but I only have five minutes to ______.

_____ students are there in your class, Mr. Li? — Fifty. [ ]

Does Charles Smith hold the world record _____ hiccupping? [ ]

Do you find _______ difficult to be independent(独立的)?.

Mr Li looks often looks tired and worried? — So he does. You see it’s not easy to such a big factory.