So difficult _______ that no one could ______ a good solution to it.[ ]

do you do as a volunteer in Africa— ______ ! There are many poor people there, who need a lot of help.

He must be leaving our village because he is __________.

Is that Jack speaking—Sorry, he isn’t in right now. He the cinema with his aunt.

What does the notice on the wall say—“No persontakebooks out of the reading room; otherwise he would be fined.”