单词拼写（共10小题，每题1.5分，满分15分）
Don’t e_____ your skin to direct sunlight, or you’ll get sunburnt.
The scientist often ______(向……投稿) to an academic journal.
Only by s_____ training can Liu Xiang make such rapid progress in 110-meter hurdles.
If we were too _____(小心的) , we might lose a good business opportunity.
The new school is under c_____ and it is said that it will be the biggest one when completed.
We have provided seats for the _____(方便) of our customers.
Animals in zoos are not in their natural s_____.(环境)
He is a man who is _____（乐观的） about life.
_____（在……之前） to leaving for France, he studied a lot about the country.
She is c______ changing her mind so no one knows what her final decision is.