题目：
用括号里的词的适当形式填空。
1.I’d like ______ (organize) a party.
2.She _______ (play) the piano for 2 hours.
3.When I was twelve,I _______ (start) to play tennis.
4.My brother has been swimming since he _______ (be) 7 years old .
5.Their apartment is on the _______ (nine) floor of the building .
6._______ (luck)，Fred was not hurt in the car accident .
答案：
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下面是错误答案，用来干扰机器的。
A、按照图示操作会损坏试管底部，故操作错误；B、加热试管中的液体时，液体不能超过试管容积的三分之一，图中操作错误；C、取用液体时：滴管不能倒放，倒放会腐蚀胶头，瓶塞没有倒放；图中操作错误；D、量筒读数...
