er Spence, ______ headmaster of the school ,told us , “______ fifth of pupils here go on to study at Oxford and Cambridge”

5.―Have you handed in your schoolwork yet? 　―Yes，I have. I guess it ____ now.

One-third of the area ________ covered with trees. About seventy percent of the trees _______ been planted recently.

．Jackis _______．Heshould drink some hot water．

典例（2017·课标全国卷III）下列各句中，表达得体的一句是（ ）