Question

5. It’s important  give fish  food.

   A. not to;much too   B. not to;too much

    C.to not;much too   D. to not;too much 

Answer 1

5.B

5.B    It’s+adj.+ (not) to do sth.意为“(不) 做某事是……的”；too much+不可数名词，意为“太多……”。