万老师：您好!我是一名浙江的学生,我给您写信是想向您讨个主意。那天天气很好,我想乘着这大好时光解难解的数学题。这时,妈妈在卫生间里喊道：“成晨,妈妈要洗衣服,可洗衣粉没了,你帮我去买一袋吧,钱在桌上!”“哦!”我马上答应了。等我气喘吁吁地把洗衣粉买来后,妈妈(?) Teacher Wan: Hello! I am a Zhejiang student and I am writing to you to find an idea for you. Good weather that day, I would like to take this great time-solving math problems. At this time, my mom shouted in the bathroom: “In the morning, my mother had to wash her clothes and wash the laundry powder. You help me to buy a bag and the money is on the table.” “Oh!” I immediately agreed. After I bought my laundry gas, my mother (?)