15. _____ U2, the Irish rock band from Dublin perform a concert in Beijing, tell me in advance.
The little girl _______ out at night alone.
--- Would you like to join us? --- Sorry, but I am not _______ as any of you.
He made _______ an excuse for his failure in order to avoid _______.
—Jim, can you work this Sunday? —________? I’ve been working for two weeks on end.
We need to get to the root of the problem______ we can solve it.