The chairman thought ________ necessary to invite Professor Smith to speak at the meeting.
--I'd like some more cheese. --Sorry, there'sleft.
Yesterday she sold her car, ______ she bought a month ago.
——What’s that noise? ——Oh, I forgot to tell you. The new machine ______.
Some children want to challenge themselves by learning a language different from ______ their parents speak at home.
I don’t believe you’ve already finished reading the book — I ______it to you this morning!