??15."a pair of +名词复数(gloves/ shoes/socks/scissors/trousers，etc.)"，?"the number of +名词复数"作主语，谓语动词用单数。
? A pair of scissors has been bought.
? The number of students was sm all.
? 而"a couple of/a score of/dozen of/ a number of +复数名词"作主语，谓语动词一律用 复数。
??A couple of rabbits have been caught.
??There come a score of people.
??Dozen of them have been sent to work in the strip mine.
??A number of students were sick.
??
??16."all(some，none，most)of...""the rest"作主语，要酌情而定，谓语既可用单数 又可用复数。
??None of the passengers were aware of the danger.(侧重全体)
??None of my friends has ever been to Paris.(侧重个体)
??Most of the apples were rotten.
??Most of the apple was eaten by a rat.
??Although the first part is easy，the rest is(are)difficult.
?
??17."one or two +名词复数"，"one or m ore +名词复数"作主语，谓语动词用复数。"a?+单数名词or two"作主语，谓语动词可用单数也可用复数。
??There are one or two subjects to choose.
??Only a word or two is(are)needed here.
??Exercises：
??用括号中动词的正确形式填空：
?