1.We should respect food and think about the people who don'

1.We should respect food and think about the people who don't have____we have here and treat food nicely .
A.that B.which C.what D.whether
2.----I prefer shutting myself in and listening to music all day on Sundays.
-----That's ___I don't agree .You should have a more active life.
A.where B.how C.when D.what
3.Before the sales start ,i make a list of _____my kids will need for the coming season.
A.why B.what C.how D.which
4.To improve the quality of our products .we asked for suggestions _______had used the products.
A.whoever B.who C.whichever D.which