Of english One hundred years ago, a fire was lighted and big pots of water (i) on the fire, to be
heated. The pots of hot water (ii) to where they were needed. All the washing (iii)
by hand and all the clothes were hung on a line to dry outside.
i) a) is putting
b) were putting
c) were put
d) is put
ii) a) were carried
b) is carry
c) is carrying
d) was carrying
iii) a) is doing
b) was doing
c) was done
d) will be done

One hundred years ago, a fire was lighted and big pots of water (i) c) were put  on the fire, to be  heated. The pots of hot water (ii) a) were carried to where they were needed. All the washing (iii)  c) was done by hand and all the clothes were hung on a line to dry outside.

Explanation:

The passage above is using the passive voice to express the actions performed. Since the passage concerns past actions, the passive voice in this case will consist of the verb to be in its past form plus the past participle of the main verb. We need to pay attention to the word that comes right before the blank, since it is according to it that we will choose if the verb to be should be singular or plural:

1. big pots of water were put - "pots" is the most important word in this subject.

2. the pots of hot water were carried.

3. All the washing was done.

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