—Why don’t you take some exercise? Sitting before the computer is bad for your health. ---________, but I have to finish my work on time.
. —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.