—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
By the time he was twelve, Edison ________ to make a living by himself .
Ladies and gentlemen, please fasten your seat belts. The plane __________.
----What a beautiful picture! ----It’s years ______ I painted a picture as beautiful as this one.
The information on the Internet gets around much more rapidly than _______ in the newspaper.
_______ meeting held last night was _________ great success.