Of the two American students , Lily is _____________ one

There are no relative articleson the Internet.What shall we do—My God！Thereare always not any useful articles when you want .

I made up my mind that under nocircumstances ______ agree to such a principle

In those days, we had no phones, so we have to keep in touch _________ writing often

old woman could not _____ theterrible noise, and she had to close the door and windows