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.
He likes novels very much , while I love science fiction _________ .
________ cold, he covered his blanket, _____ only his arms _____ .
Tom and Jack are both very clever. ________, Tom is _______ Jack.
--- Is that 120? My brother is seriously ill! ---Ok. Help is _________ .
I think that ____ very difficult to learn.