—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
His __________ towards work left us a good impression.
What’s your attitude __________ that problem?
— Would she mind playing against her former teammates?—__________ She is willing to play against any tough players.
Since he was 67, it didn't seem __________ that he would continue long in that position.
It is obvious that talking about something behind others is what everyone will not __________.