Please help!!!! 20 points and brainliest!!!!!

1. Select the topic sentence.

[1] What is amnesia? [2] Most of us think of a dramatic, total loss of memory brought on by a severe blow to the head. [3] Amnesia is, however, a very subtle and sometimes sinister illness. [4] While amnesia can result from a head injury, overwork and worry can also lead to memory lapses. [5] In some cases, diagnosis is difficult because these lapses are intermittent, rather than constant.
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2. Select a suitable topic sentence to add to this paragraph.

The old saying "lightning never strikes twice in the same place" is not true. Ranchers see bolts flash many times among isolated trees or on a strand of barbed wire. Forest rangers manning fire towers report that every thunderstorm brings several flashes to their lofty outposts. Lightning rods are a necessity for radio towers and skyscrapers.

Lightning rods are essential.
Lightning can strike trees, fire and radio towers, and skyscrapers.
Forest rangers have a dangerous job.