Idiom: waste of time

[Guest]

Test No. errors/advan-7 "At the Meeting", question 8

It would be a complete wastage of time if we tried to debate that issue again because last time we reached no conclusion.

(a) would be
(b) wastage
(c) issue
(d) conclusion

Test No. errors/advan-7 "At the Meeting", answer 8

It would be a complete waste of time if we tried to debate that issue again because last time we reached no conclusion.

Correct entry: waste
The error was: (b) wastage
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instead of wastage, we should use waste.

[Mister Micawber]

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Yes: the idiom is a waste of time, for an activity which is of no value or which is unproductive.
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Native English teacher at Mister Micawber's