"The introductory paragraph of (introduction to) the essay is usually written by a combination of some strategies:
(i) mentioning the topic of essay or opinions given in the instruction; (ii) explaining why the topic is either interesting or important; (iii) giving some general information or statements related to the topic; (iv) stating the purpose of essay or defining the structures of other paragraphs."

Now as for this topic, some of these strategies are used. Can you complete the following sentences as points which can be given in the introduction by guessing the incomplete words.

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strategy ii

The why the safety of products is important.

()

strategy ii

With method this can be ensured.

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strategy i

The which this method has aroused.