—Hi, Tracy, you look tired.—I am tired. I the living room all day.
. —Have you finished the work? —Not yet. I _______ to do it just a moment ago.
. ______ is known to everybody, the moon travels round the earth every month.
. When you are driving on this road, you have to limit your speed _____ 60 miles per hour.
. —What do you mean. There are only ten tickets? —There ______ be twelve.
. Jane is said _______ an opera singer in her youth.