__ the fact that too much fat can beharmful, a moderate amount of fat is actually essential to the maintenance ofgood health

It is generally considered that a taxi driver ought to be quite familiar ________ the streets in the city.[ ]

Thank god, you finally returned home ________ —You can never imagine how I worried about you when I was told about the terrible accident

(2013·福建高考)Mrs.Smith finds it hard to clear up the mess, as her children are always ________ whenever she tries to

I think it unwise to live ______ one’s income, as is the case with a lot of young people today, who often turn to their parents for help