51. when you have finished with that book, don’t forget to put it back on the shelf,______?
A. will you B. do you C. don’t you D. won’t you
52. Mary is ______ hardworking than her sister, but she failed in the exam.
A. no so B. no more C. not less D. no less
53. which of the following statements in incorrect?
A. Five miles seem like a long walk to me.
B. Ten dollars was stolen from the cash register.
C. Either my sister or my brother is coming.
D. Only one out of six were present at th