Complete the passage with the words

Complete the passage with the words :           
                                             In addition / I believe / Secondly / For these reasons        
.....................(1) the best activity for teenagers is group activity. Firstly , teenagers like to feel that they belong to a group .............. (2), being part of a group help teenagers make friends. Friendships are very important to teenagers. ....................(3) they will make friends with people who have the same interests as them ...................... (4) I think group activities are best for teenagers