—Have you been to Mexico?—No, I ______ last year, but Dad wouldn’t let me.
is known to us all, the earth is round.That is to say is known to us all is that the earth is round .
They broke into They broke into prison and set free all the people in prison.
Tom was absent from school today. We guess he .
got into the room the telephone rang.
In fact, radium not damaged their health, but also made the laboratory equipment they were wording radioactive.