The number of people invited to the party 200 but a number of them ___absent for different reasons.
—Why are you standing here? —I’m waiting for Shirley. She will be back _____.
. By the year 2020 scientists _____ a lot of research on AIDS.
_____ is commonly believed that the play was written by Shakespeare.
He made a promise____he would achieve the success that his parents were looking forward to.
After a knock at the door, the children heard his mother’s voice him.