6. You ______ all the calculations of the students' scores. We have the computer software to do that job. ( )��

　　A. needn't have done B. mustn't have done��

　　C. shouldn't have done D. couldn't have done��

　　7. John is supposed ______ his term paper last. week, but he hasn't finished it yet. ( )

　　A. to hand in B. to be handing in��

　　C. to have handed in D. to have been handed in��

　　8. You can see this type of ATM ______ in almost every commercial bank. ( )��

　　A. used B. using

　　C. use D. to be used��

　　9.I like playing video games ______ to the music. ( )��

　　A. more than to listen B. more than listening��

　　C. than listening D. rather than to listen��

　　10. You can't be ______ cautious in making the decision as it concerns your son's future.�� ( )��

　　A. very B. rather

　　C. too D. so��