know Australia was, as a matter offact,________ used to be a nation of prisoners

_________ David be the new chairperson of the Students’ Union— He ________ be, but I’m not sure.

When did your uncle arrive_______ China— He got to Guangzhou ________ the morning of the 16th of May.

Many officials call for global cooperation to ________ some”real security threats” the world is facing.[ ]

How long have you known the doctor — hehelped me three years ago.