题目

Life is not easy,so I’d like to say “When anything happens ,believe in yourself.” When I was a young boy , I was 1 shy to talk to anyone.My classmates often 2 me.I was sad but could do nothing,Later, 3 happened,and it changed my life.It was an English speech contest.My mother asked me to 4 it .What a terrible idea!It meant I had to speak before all the teachers and students of my school. “Come on,boy.Believe in yourself.You are sure to 5 the contest.”Then mother and I talked about many different topics.At last I chose the topic “Believe in yourself.”I tried my best to remember al已知点A（t2，t+），点B（2t+3，1），=，若向量对应终点C落在第一象限，则实数t的取值范围是________．