(1) with so many young, single people having babies, the question arises as to how happy they are being young parents. (2) a national survey of young, single mothers and fathers reveals that most were happier before they became parents. (3) sixty-seven percent of the nine thousand new parents who responded to the survey said having a baby presented more problems than they envisioned. (4) fifty-six percent of the respondents said they had to drop out of school, despite their hopes that they could manage schoolwork plus rearing a baby. (5) a majority (73 percent) said they were forced to seek financial from family, friends, and/or government agencies, and 37 percent said they accepted low-paying, unsatisfying jobs out of necessity. (6) also, 70 percent said they missed the "good times" with friends that they enjoyed before their babies were born. the sentence that expresses the main idea is: (choose the number of the sentence.)