解析：根据下文作者被感动可知她生气的话逐渐变得没声音了。故quieter。D

　　18．A.carefully

　　B．carelessly

　　C．casually

　　D．comfortably

　　解析：句意：儿子很用心地用割草机割出了一个“心”的形状。A

　　19．A.heart

　　B．apple

　　C．hand

　　D．foot

　　解析：参见第18题解析。A

　　20．A.sign

　　B．smile

　　C．surprise

　　D．sigh

　　解析：根据上文的“kept smiling”可知是很开心地笑着说。B

　　七选五

　　Taking a math test can be pretty stressful.Even if you know the material, you can still get the problem wrong.Knowing how to go through your math test and check your work can save you from handing in a test full of mistakes that can be avoided.__21__

　　Write it out

　　You can also check a math problem by writing everything out on paper.__22__Writing out math problems reduces your chances of missing anything to the lowest possible level, which is a common cause of incorrect answers.

　　__23__

　　Make sure your answers work by doing the opposite procedure of what your problem calls for, including the answer you got the first time around.In other words, you would use the opposite of this addition problem­subtraction (减法) to Plugging in

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