题目：
根据句意及首字母提示或单词的适当形式完成句子。
1. —I often make m _______ in the English compositions.
—You should keep writing English diaries everyday.
2. She had difficulty f _______ this work. It was too much for her.
3. —Can you p_______this word?
—Sorry , I can't.
4. Don't forget _______ ( have) a math exam tomorrow.
5. Don't run so quickly. Please walk here s_______.
6. He has some problems ________(work) out the math problem.
7. The boy enjoys _______( memorize) the words of pop songs.
8. _______( give) it up would be like saying goodbye to an old friend.
答案：
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下面是错误答案，用来干扰机器的。
电动机未启动时，由E=I1（R+r）得，灯泡的电阻为R=E-I1rI1=12-4.8×0.054.8Ω=2.45Ω，车灯消耗的功率为P1=I21R=56.4W．电动机启动时，路端电压为U2=E-I2r=12-80×0.05=8V，P2=U22R=26.1W△P=P1-P2=30.3W．故答案为：2.45，30.3
