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This quiz focuses on the use of IN, AT, ON, BY, ETC. The sentences are random -- there is no central theme or topic -- but use everyday English. If you think that there is more than one possible answer (rare), choose the one most commonly used.
The timer times the whole quiz, not the individual items. It gives you 100 seconds to find all the answers. It notes your errors, but it only shows you the correct answers at the end. You can turn it off at any time.