24. Mr. John, accompanied by several members of the committee,………. . proposed some changes of the rules. a. have b. has c. are d. is 25. The flock of birds…………. . circling overhead. a. gets b. are c. is d. get 26. The levels of intoxication…………. from subject to subject. a. has been varied b. have been varied c. varies d. vary 27. The majority of the students………. . him to be innocent a. was made b. believe c. makes d. make 28. The pair of the pliers………. . on the table. a. was b. were c. put d. puts 29. The use of credit cards in place of cash………. . increased rapidly in recent years. a. have been b. has been c. has d. have 30. Advertisements on television…………. . becoming more competitive than ever before. a. has b. have c. are d. is