Identify the topic sentence of this paragraph Some books read in childhood are truly unforgettable. Some of the characters, the paces, the adventures experienced with so much excitement when one is quite young, stay in one’s mind as long as memory lasts. Such a character is Long John Silver in Robert Louis Stevenson’s Treasure Island . Who could ever forget him as he walked along the decks of his ship as quick on his crutch as other men with two good legs? As for Alice, who could ever forget her as she talked with the caterpillar and argued with the ill-tempered queen? She remains forever as a child in memory. Childhood memories of Tom Sawyer and the joy Tom and his pals had remain clear in spite the passage of time. Who would give up these perfect childhood memories?