The students were instructed to do the experiment carefully and to ________________ their reports at the beginning of next week. (turn)
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I didn’t travel much when I was younger, but I’m certainly __________________ lost time now.
Successful people are the ones who __________________ things for the rest of the world to keep busy at.
Seeing that more and more people are concerned about the quality of ______________ environment, John is considering starting an interior decoration business. It seems certain to earn ________, but he does not yet have enough money __________________ it.
This _______________ is primarily used for ________________ of the sound quality of electronic media. It was invented in the US, but now it is used ______________.