Some of the rubbish, such as food, paper and iron, _____ away over a long period of time. 

A. rot    B. rots    C. is rotting    D. are rotted

Some of the rubbish, such as food, paper and iron, _____ away over a long period of time.

1. A.
   rot
2. B.
   rots
3. C.
   is rotting
4. D.
   are rotted

In our everyday life, some of the rubbish, ________ food, paper and iron, rots away over a long period of time.