13. Dynamite ………………. by Alfred Bernard Nobel.
A. have been invented B. invented
C. was invented D. was being invented
14. Do you believe that such a problem can ……………….?
A. solve B. be solving C. is solved D. be solved
`15. This picture ……………….. by Johnny when I came.
A. painted B. was painted
C. was being painted D. had been painted
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