Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.

Children ___(1)___ 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 ___(2)___ the child from remembering what has just been said. Considered an "invisible" ___(3)___, such learning disabilities can be detected by alert parents before the children go to school. ___(4)___ 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 ___(5)___ the ABCs. First-graders may commonly reverse their letters, writing ad or ab, 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.