Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks

Children (26)________ appear intelligent and have normal sight and hearing may nevertheless have learning disability such as dyslexia, difficulty in reading; dysgraphia, difficulty in writing; dyscalculia, difficulty with numbers; and auditory-memory problem that (27)________the child from remembering what has just been said. Considered an "invisible" (28)___________, such learning disabilities can be detected by alert parents before the children go to school. (29)________ the child at about thirty months is not developing normal language skills, something is amiss. A child who cannot do puzzles or put pegs in holes lacks perceptual-motor skills. Kindergarteners should (30)________the ABCs. First-graders may commonly reverse their letters, writing a d or a b, but if they are still doing this at the start of second grade, they should be tested for learning disabilities. Proper and early treatment is essential.