I am doing sums. A. Sums are done by me. ...

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I am doing sums.

A. Sums are done by me.

B. Sums are being done by me.

C. I must be doing the sum.

D. sums must be done by me.

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This box contains twelve coins.

A. Twelve coins are contained by this box.

B. Twelve coins are contained in this box.

C. Twelve coins have been contained by this box.

D. Twelve coins have been contained by this box.