阅读下面短文，用括号内所给动词的适当形式填空
I am John．I am l7 years old，and I live in England．My father works in a horse-riding school．I have been riding since I（61） _____ （be）six．I go horse-riding every Saturday．Now, I can ride quite well．I often（62） _____ （spend）all Saturdays at the riding sch001．I help to get the horses ready．I also help the new students．
Look，there are some people（63） _____ （train）horse-ridin9．The girl named Xinyi （64） _____ （walk）the horse around（遛马）and getting ready to get onto the horse．She is from China．She looks beautiful．She（65） _____ （study）here three times．Last time，I helped her move up and down at the same time as the horse（随着马动的频率）．while we were learning how to jump the horse，suddenly she fell off the horse and（66）_____（hurt）her knees badly．I felt sorry that I（67）_____（not help）her at that time．I thought she wouldn’t come this Saturday．To my surprise。she came again! What a brave girl! Last month，she（68） ____ （invite）to come to England for a fashion show．She said she was glad to have the chance to come here and she enjoyed herself．
Oh，Xinyi is riding towards me．
“Hi，Xinyi! You’re great! I have never seen such a brave girl like you．”
‘Thanks．John! I am leaving for Beijing tomorrow．Thanks for helping me these days．I will never forget the exciting experience．I（69） _____ （share）it with my friends．”
“I hope（70） _____ （meet）you soon．”
的单调增区间是（）。