Sure, let's fill in the blanks based on the research provided:
1. According to research, older teens are in serious relationships more often than younger teens.
2. Among 13-14-year-olds, about 20% are currently in relationships that are not serious.
3. 75% of 15-17-year-olds have experience with dating compared to 35% of 13-14-year-olds.
So, the full statement is:
According to research, older teens are in serious relationships more often than younger teens.
Among 13-14-year-olds, about 20% are currently in relationships that are not serious.
75% of 15-17-year-olds have experience with dating compared to 35% of 13-14-year-olds.
