The given pairs in the question show a relationship between two objects or actions. In each pair, the first word represents the tool or object used for the second word. For example, "sepatu" is used for "jalan" (shoes are used for walking), "pensil" is used for "makan" (pencil is used for eating), "garpu" is used for "makan" (fork is used for eating), "sisir" is used for "rambut" (comb is used for hair), and "buku" is used for "baca" (book is used for reading). Therefore, the correct answer is "garpu : makan" because a fork is used for eating.