单词拼写(共10小题；每小题1分，满分10分)
81. During my a_____________, my neighbor took care of the dog for me.
82. It’s believed that eating vegetables and fruit is b__________ to our health.
83.I don’t care what you think. As far as I am c__________, what they did was wrong.
84. Students should try to become more _____________(独立的) of their teachers.
85. She has a natural ability to sing well. In other words, she has a t________ for singing.
86.Most smokers are perfectly a__________ of the dangers of smoking.
87. Police are appealing to any driver who may have __________(目睹) the accident.
88. Mary's t____________  is so sharp that it will get her into trouble one day.
89. I’m not surprised that he became a writer. Even as a child he had a v_____ imagination.       90．Everyone in the class is expected to p__________ in the discussion.