What ______ enjoyable idea it is!

The English exam is not difficult, is it?　 — _____. Even Tom _____ to the top students failed in it.　[ ]

It is illegal for a public official to ask people for gifts or money _______ favors to them[ ]

__ at the cafeteria before, Tina didn’t want to eat there again.

The famous reporter, who is said to have gone back to America last year, _____in China foralmosttwenty years.[ ]