15. Every boy and every girl ______ in our class.
A. are working B. are worked
C. is working D. is worked
答：C。
16. The family ________ all music lovers.
A. is B. are C. was D. be
答：B．集合名词的主谓一致：class．class, team, group, family, crew (船员)，court(法院，法官)，audience(观众，听众)，government(政府，政府官员)，committee(委员会，委员会成员)，population(人口)等词做主语时．若看作整体时，谓语用单数；若看作个体时，谓语用复数形式．如：
The class is made up of 50 students.这个班有50名学生。
Tbe class are having an English class.这个班的学生正在上英语课。
17. Your trousers_______ dirty, you must have______ washed.
A. is, it B. are, it
C. are, them D. is, them
答：C．表示成双成对的部分构成的物品如scissors剪刀，tongs钳子，glasses跟镜，clothes衣物，trousers裤子等做主语时，谓语用复数形式．指代它们的代词也用复数形式。若用a pair of (a suit of)做主语时，谓语用单数形式。
18. The police the murderer everywhere when he suddenly appeared in a thea-tre.
A. is searching for B. were searching for
C. are searching for D. were searching
答：B．police．people，cattle，folk等形式为单数形式，但其意义为复数，谓语用复数形式。
19. Everything in the room including the table and chairs ______ new.
A. are B. is C. were D. be
答：B．everything是主语，谓语应用单数，详见第l题解析。
20. The Chinese people __________ a brave and hard-working people.
A. are B. is C. has D. have
答：B．此句意为“中华民族是一个勤劳勇敢的民族。”句中people作“民族”解。
21. Every means ________.
A. has tried B. have tried
C. has been tried D. have been tried
答：C。此句意为“每一种方法都试过了”。means，works(工厂)，sheep，fish，deer等词属单复数形式相同的词。
22. The worker and writer _______ going to give us a lecture.
A. are B. is C. were D. have been
答：B．and并列两名词做主语时，若指一个人兼两个职务时，谓语用单数形式。