Sentence Correction
For some days the new professor lectured above the heads of his pupils.

No correction required
through the heds of
over the heads of
over the head of
on the heads of

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Sentence Correction
In below compare the bold part of each sentence with expressions A, B, C, D and E. choose the correct expression which is an improvement upon the bold part.This is one of the most important inventions of this century.

No correction required
invention of this century
invention of centuries
invention of these century
invention of the centuries

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