For each question, choose which of the four possible answers fits the space best. Also think about why the other three answers are not possible.
1. Singers take care of their voice to guarantee ________ performance.
2. Even if you can't quit smoking, you should do your best to at least ________ down a bit.
3. The charity dance raised $5000 and the hospital was able to buy a new heart ________.
4. It is often only through long experiments of trial and ________ that scientific progress is made.
5. The working day in the factory is divided into day and night ________.
6. The job is tough, lonely and yes, on ________, even depressing.
7. The shopping centre was built surrounded by a vast ________ of concrete for parking.
8. Every person in this room has ________ an important part in the success of the company.
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