Help with Japanese please?

Question:

Are these sentences correct? If not how do I fix them?

I go shopping for food twice a week.
Watashi wa tabemono o shu ni ni kai kaimasu.

and

I watch TV for two hours every day.
Watashi was terebi o ichinichi ni ni jikan o mimasu.

Answer:

>Watashi wa tabemono o shu ni ni kai kaimasu.

This is correct.

>Watashi was terebi o ichinichi ni ni jikan o mimasu.

Was is "wa", right? You do not need "o" at the end.