Explanation:

(a) Electricity has two main uses:  industrial and domestic. (b) ‘When Mahua comes,’ she said, ‘Anand always goes to meet her.’ (c) ‘I wonder when will they come’, he said. (d) We decided to have rest. It was too hot to go any further.

1). Electricity has two main uses: industrial and domestic.

2). ‘When Mahua comes,’ she said, ‘Anand always goes to meet her.’

3). ‘I wonder when will they come?' he said.

4). We decided to have rest, it was too hot to go any further.

Explanation:

• Punctuation marks are elucidated as the signs and symbols that enhance the readability of the sentence.
• It signals the readers about the construction of the sentence and assists them in understanding the meaning of the text comprehensively.
• The first sentence introduces the items to be included in the list(uses of electricity) which is signaled by the use of colon(:).
• The second sentence expresses the statements spoken during speech. Thus, it requires comma(,) before quoting the exact words of the speaker.
• Similarly, a question mark(?) is required before closing the quotation in the fourth statement to indicate the readers about the question put up by the speaker.
• The last sentence includes two independent clauses which could be linked by using a comma(,) aptly to separate the ideas.

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