15.(A). He interferes in the affairs of others.

　　(B).He frequently receives medals.

　　(C). He is in business of selling metals.

　　(D). He operates several businesses.

　　16.(A). He left the laboratory at three o’clock.

　　(B). He was unable to perform the experiment.

　　(C). He gave up his laboratory courses.

　　(D). He did three experiments.

　　答案与音频文本：

　　A B

　　15. Gordon is always meddling in other people’s business.

　　16. He attempted the experiment several times, but he gave up after three hours in the laboratory.