When I try to understand ____ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.
| A．why does it | B．what does it | C．what it is | D．why it is |
The boy, _____ leg was injured in the football match, was only 11 years old.
| A．which | B．whose | C．who | D．whom |
They work day and night; however, _______ of the money they make goes to their so-called eldest brother.
| A．four-fifth | B．four-fifths | C．four-five | D．four-fifths |
The one and only thing I ____ is whether you take a good rest！
| A．care for | B．look for | C．care about | D．look after |
— Is there anything you want to know?
— I just wonder ____ that makes Jim so excited.
| A．what it is | B．what he does |
| C．how it is | D．why it does |
She says she still remembers the things and the persons ______ I told him last year.
| A．which | B．that | C．who | D．whom |