11. The teacher said this water was…………..and couldn’t be used in our experiment.
A.unhurt B. unlimited C. impossible D. impure
12. She can’t come to the party next Saturday as she ………………on that day.
A.works B. will work C. will be working D. is working
13. The new invention could have a range of …………………in industry.
A.advance B. goodness C. concerns D. applications
14.Apple Inc., has been one of the ………………in the computer software field.
A.lead B. leading C. leader D. leaders
15. The calories in the food we eat are a form of ………………………energy.
A.chemical B. chemist C. chemistry D. chemise
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