用所给词的适当形式填空，每词限用一次，使短文完整、正确.

believe，difficult，is，level，year，though，valuable

Dear students，you will graduate from your school soon.At this special moment，I'd like to say something helpful to all of you.Never fail （1） 　 　thankful to your parents，your teachers and your friends.They are （2） 　 　of all the people around you.The life of senior high school is on the way.Maybe you'll make a lot of mistakes along the way.However，along with many （3） 　 　，there will also be many exciting things waiting for you.Choose wisely and be responsible for your decisions and actions.（4） 　 　you have to go your separate ways now，I hope that in a few（5） 　 　time，you'll come back to visit our school.

Good luck and hope to see you again sometime soon!