S1: Don’t you think that the housefly is a nuisance?

S6: When you see a fly rubbing its legs together, it is just cleaning itself, and scraping off some of the material that has gathered there.

P: For ages that’s what man considered the fly to be -just a nuisance.

Q: It was discovered that these flies carried disease germs that cause the death of millions people every year.

R: But now we know that the innocent-looking housefly is one of man’s worst enemies.

S: It makes an irritating buzzing sound; it annoys you when it crawls on your skin; and so on.

The proper sequence should be

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