I was so familiar with him that I recognised his voice ____I picked up the phone.
We ______ the difficulty together, but why didn’t you tell me?
______ at the door before you enter my room, please.
Our friendship _____ quickly over the weeks that followed.
—Have you heard about that fire in the market? — Yes, fortunately no one _____.
Many people have donated that type of blood; however, the blood bank needs _____.