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

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

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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.They examined both the samples very carefully but failed to detect any difference in them.

any difference between
some difference between
any difference between
any difference between
some difference in

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