Read the passage. (1) last summer, some friends and i started a daytime babysitting service. (2) much to our surprise, the service became very popular. (3) especially with working parents in our neighborhood. (4) to keep the children active, we took them to a local playground. (5) we also taught them songs and outdoor games. (6) because i want to be a teacher, i found the experience very valuable. (7) i also made some money for college! which is a sentence fragment? sentence (4) sentence (3) sentence (5) sentence (6)