Choose the correct answer

Ex1. Choose the correct answer
1. Mathematics.......... . not always an exact science.
a. was b. are c. is d. were
2. Mr. John, accompanied by several members of the committee,.......... . proposedsome
changes of the rules.
a. have b. has c. are d. is
3. The flock of birds............. . circling overhead.
a. gets b. are c. is d. get
4. The levels of intoxication............. from subject to subject.
a. has been varied b. havebeen varied c. varies d. vary
5. The majority of the students.......... . him to be innocent.
a. was made b. believe c. makes d. make
6. The pair of the pliers.......... . on the table.
a. was b. were c. put d. puts
7. The use of credit cards in place of cash.......... . increased rapidly in recenty ears.
a. have been b. has been c. has d. have
8. Advertisements on television............. . becoming more competitive than ever before.
a. has b. have c. are d. is