We don't go to school ________ Sunday.

1. A.
   at
2. B.
   in
3. C.
   on
4. D.
   of

We don't go to school ______ Sunday.

[   ]

　　A. in   B. at   C. by   D. on

[　　]

We don't go to school ________.

[　　]

We don't go to school ________ Saturday or Sunday.

[　　]