There is nothing _______.

1. A.
   for us to worry
2. B.
   of us to worry about
3. C.
   of us to worry
4. D.
   for us to worry about

There is nothing for him ________.

1. A.
   worry
2. B.
   worries
3. C.
   to worry
4. D.
   to worry about

There is nothing for us _______．

　　A．to worry about B．to worry

　　C．worrying about D．worry about