1)The police has arrested five people 2) I have never eat such a bad meal 3) There is a museum which has rich collection

Корректировка выглядит следующим образом:

1) The police have arrested five people.

2) I have never eaten such a bad meal.

3) There is a rich collection of toys in the museum.

4) I know you are busy now. You don`t need to do the all the work today. You can do it tomorrow.