問題詳情：
Hostess: What advice would you give to singers facing voice problems?
Doctor: If pop singers have got voice problems, they really need to be more __11__ (select) about where they work. They shouldn't work in smoky atmospheres. They also need to think about __12__ (rest) their voices after a show. Something else they need to be careful about is medicines. Aspirin, for __13__， singers should avoid aspirin. It thins the blood. And if a singer coughs, this __14__ result in the bruising (受傷) of the vocal cords.
Hostess: And is __15__ true that some singers use drugs before concerts to boost (提高) their voices when they have voice problems?
Doctor: Yes, this __16__ happen on occasion. They are easilyavailable on the continent and they are __17__ (use) if a singer has problems with his vocal cords and has to sing that night. But if they __18__ (take) regularly, they cause a thinning of the voice muscle. Most pop singers suffer from three things: lack of training, overuse and abuse of the voice, especially __19__ they are young. They have difficult lives. When they go on tour, they do __20__ vast number of concerts, singing in smoky places.
【回答】
ctive ing ple ul taken 20.a
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