The baby looks healthy ,but from time to time it___a cold

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• The baby looks healthy ,but from time to time it___a cold
• .–What can I do for you?--I want to buy a pair of l___________shoes for my husband.44.She sen.–What can I do for you?--I want to buy a pair of l___________shoes for my husband.44.She sent an e-mail to e___________her best wishes to the headmaster.45.I’m not sure w__________it’s time to go to school or not.46.The pair of blue jeans with two big p___________looks very ugly.47.People wear w__________to protect themselves from the wind in cold weather.48.
• There is usualy a great deal of ___(rainy)?
• x>=0,y>= 0 x+2y=1/2 求函数log1/2(8xy+4y^2+1的最值