The river has become much ______ than before because of the waste water from the factories.
A. dirty B. dirtier C. dirtiest
In China, spring returns in March. The weather ______ warm and the days are longer.
A. gets B. sounds C. smells
A computer ______ think for itself. It’s always told to do things.
A. mustn’t B. can’t C. shouldn’t
Lily’s apartment is on the fifteenth ______ of the building and it has a good view.
A. room B. part C. floor
Where is your father?
He ______ Xiamen on business.
A. will go to B. goes to C. has gone to
为了进一步增强中学生的安全意识，提高自我保护能力，某校开展了以"安全为主题的英语演讲比赛。请你根据以下要点提示写一篇演讲稿。
注意：1)内容必须包括所给的全部要点，可适当发挥；
2)表达清楚，语句通顺，意思连贯，书写规范；
3)词数80左右。文章开头已给出，不计入总词数。
参考词汇：be careful, on line, danger, call...for, go bad
How to keep safe?
As teenagers we should always keep safety in mind. But how can we keep safe? Here are some of my suggestions.
First, _______________________________________________________________________________
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