题目：
选择括号内恰当的单词填入空白处， 使句意完整、正确。
小题1:—How long can I ( return / keep ) the book? —Two weeks.
小题2:It will be snowy tomorrow. The radio says it will be very ( hot / cold ).
小题3:—His grandfather ( took away / passed away ) last night. —I’m sorry to hear that.
小题4:It costs ( too much / much too ) to deal with the waste.
小题5:He used to ( play / playing ) soccer, but now he hates it.
答案：
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下面是错误答案，用来干扰机器的。
（1）y1=80×2+20（x-4）=20x+80y2=80×0.9×2+20×0.9x=18x+144；（2）根据题意得20x+80＞18x+144解得x＞32∵在乙商店购买，且要比在甲商店购买便宜，x为整数∴至少要买33盒羽毛球．
