1. A large number of students in this school………. . English quite fluently. a. speaks b. is speaking c. has spoken d. speak 2. A series of lectures………being presented at the Central Hall this week. a. are b. will be c. has become d. is 9. John, along with twenty friends, ………. planning a party. a. are b. is c. has been d. have been 10. Mathematics………. . the science of quantity. a. was b. are c. is d. were 11. Measles………cured without much difficulty nowadays. a. is b. are c. will be d. have 14. The army…………. eliminated this section of the training test. a. has b. is having c. are d. have 18. The quality of the recordings ………. . not very good. a. is b. are c. is being d. has been 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 Chọn và giải thích giúp mk ạ