The Sanlu Milk Powder event is a clear indication that food safety is a big problem; nobody can ___ all foods are secure to us, but we are sure that the situation is turning for the better.
—Shall I open the window to let some fresh air in?. —No, ______.
Someone called me up in the middle of the night, but they hung up ______ I could answer the phone.
Please tell me the way you thought of ______ the garden.
In New England, I made lots of friends ______ a very practical knowledge of the English language.
______ top students who were excellent at every subject all went either to Bashu or the No. 3 Middle School of Chongqing.