I just wonder _______that upsets him so much.
| A．what it is | B．what he does | C．how it is | D．why it does |
How did it that he is so badly off when he earns quite a good salary?
| A．come out | B．come up | C．come along | D．come about |
Both the summer and winter Olympic Games every four years.
| A．break out | B．come about | C．happen | D．take place |
How did you such a clever way out of difficulty?
| A．think over | B．think about | C．think up | D．think on |
You will sooner or later if you keep working like that.
| A．break off | B．break down | C．break into | D．break out |
. We wanted to get home before dark, but it didn’t quite _____ as planned.
| A．find out | B．turn out | C．carry out | D．set out |