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

through the heds of
on the heads of
No correction required
over the head of
over 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.You need not come unless you want to.

You don't need to come unless you want to
You come only when you want to
You needn't come until you don't want to
No correction required
You come unless you don't want to

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