John opened the door. There _______ he had never seen before. [ ]

Do you know that the UK is _______ European country— Yes， it is also _______ island one.

You must return my book to me . You _______ it for two weeks.

I don’t like any humor in serious speech because I can’t think of any circumstance _______ this would be beneficial or useful.

Tom, why not stop ________ a rest— Oh, no, Mum. It’s so exciting that I can’t stop ___ the kite.