单词拼写（共10小题；每小题1分，共10分）
A great celebration was held on his _________(50岁)birthday.                
He dived into the water, leaving only his face _________(暴露)             
Some people work together under _________(压力)                     
He said he was late because of a traffic jam. But it didn’t sound like
a      _    （合理）enough excuse.
A _______（图书管理员）is a person who helps you when you want to borrow books from a library. 
They needed five more ____ (工程师) to complete the design.            
They were _______(秘密地)married last week.                           
She was well known as an ______(出色) dancer                          
His job is to do ________(科学)research.                                
He has formed the habit of getting up and going to bed early and does
everything ________(有规律)