--- He was nearly drowned once.--- When was _____?--- _____was in 1998 when he was in middle school.
. 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.
If we canour present difficulties, then everything should be all right?