Voice
In the following question, a sentence has been given in Active/Passive Voice. Out of the four/five alternatives suggested, select the one which best expresses the same sentence in Passive/Active Voice. One should keep one's promise.

A promise should be kept.
One's promise should be kept.
A promise should be keeping.
One's promise has to be kept.

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Voice
Boil the water and cool it before you keep it in the fridge.

Let the water be boiled and cooled before it is kept in the fridge.
Let the water be boiled and cooled before it is kept in the fridge by you.
Let the water be boiled by you and cooled by you before it is kept in the fridge.
Let the water be boiled, cooled and kept in the fridge.

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Voice
The boys were playing Cricket.

Cricket was being played by the boys.
Cricket had been played by the boys.
Cricket has been played by the boys.
Cricket was played by the boys.

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Voice
James Watt discovered the energy of steam.

The energy of steam was discovered by James Watt.
James Watt was discovered by the energy of steam.
James Watt had discovered energy by the steam.
The energy of steam discovered James Watt.

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