13. They have ___.

A. enough food to eat      B. food enough eat

C. enough food eating      D. food enough eating

14. --Must I clean the cage today?

   --No, you___.

A. must not    B. can not    C. need not    D. may not

15. She ___ so much ___ her mother.

A. looks; like   B. looks; for   C. looks; after   D. looks forwards; to