Units 1---5单元测试题 1. About 80 percent of the students in our school_____ been working on the program and about two-thirds of the work _____been finished. A. have; has ?? B. has; have, 　 C. have; have D. has; has / 2. It is Tom rather than his classmates that _____responsible for what has happened. A. are B is C. were D. was 3. A number of books ______ been stolen from the library since the beginning of this term and the number _____ as large as 500. A. have; are B. has; is C. have; is D. has; are 4. Six years _____ passed and six years _____ not a short time. A. has; is