23. A number of students _____from the south.

　　 A. are　　 B. is　　 C. have　　 D. has

22. No one except my parents _____anything about it.

　　 A.　　 know　　 B. knows　　　　　　　 　　 C. is knowing　 D. have known

21.　 This pair of shoes ____made in Nanjing.

　　 A.is　　 B. are　　 C. have been　　D. had been

20.　 Between the two rows of trees _____the teaching building.

　　 A. stand　 B. stands　　　　 C. standing　 D. are

19.　 They each ____ a beautiful handkerchief.

　　 A.　have　　　 B. has　　　　　 C. there is　　 D. there are

18.　 Each of the students _____ a Chinese-English dictionary.

　　 A.　have　　　 B. has　　 C. there is　　 D. there are

17.　 Mathematics ____the language of science.

　　 A.　are　　　　 B. are going to be　　　 C. is　　　　　　 D. is to be

16.　 Half of his goods ____ stolen the other day.

　　 A. are　　 B. were　　 C. is　　 D. was

15.　 That they were wrong in these matters _____ now clear to us all.

　　 A. is　　 B. was　　 C. are　　 D. were

14.　 Although the first part of the book is easy， the rest ______.

　　 A. are difficult　　　　　　　　　　 　　 　　 B. has proved difficult 　　 　　 C. is supposed difficult　　　　 　　 　　 D. have been found difficult