根据下列句子及所给单词的首字母，写出各单词的完全形式（每空限填一词）。
I saw an alien get out of the UFO. Isn’t that a________.
The old men should be spoken to p________.
——Shall we meet on W_______ or Thursday?——Either day is OK with me.
I don’t remember w________ I have left my keys at home or in the car.
Don’t tell anybody. It’s just b________ you and me.
Many young people like to study a______, such as in Britain or in the USA.
Keep s________ and have a happier, healthier and better life.
S_________ across the Pacific Ocean when it is possible. This is what your parents said.
When I got to the school, I r________ I had made a mistake that I had left my homework at home.
I think as teenagers, we should be allowed to make d________ for ourselves.