HELP!

I have choise between present continuous or present simple.
I need your help to correct answers:

-Are you hungry? "Do you want" something to eat?
-Jill is interested in politics but she "doesn't belong" to a political party.
-Don't put the dictionary away. I"am using" it.
-Don't put the dictionary away. I" need" it.
-Who is that man? What "does he want"?
-Who is that man? Why " is he looking" at us?
-George says he's 80 years old but nobody "believes" him.
-She told me her name but I "am can not remembering" it now.
-I "am thinking" of selling my car. Would you be interested in buying it?
-I "think" you should sell your car. You "don't use" it very often.
-I used to drink a lot of coffee but these days I "am prefering" tea.
-Air "consists" mainly of nitrogen and oxygen.
-She's smiling because she "is thinking" about her boyfriend.
-John is very rich. He "haves" house, a flat and two cars. He has a house, a flat and two cars.
-The cook "is tasting" the soup now.
-This cake "tastes" delicious.
-Sue "is having" breakfast at the moment.
-Pamela "think" English is an easy language to learn.
-I "don't understand" that sing over there. What "does it mean"?
-Paula and Jack are in the sitting-room. They "are listening" to the news, and Paula "is looking" at a magzine as well.


(Tengo que saber si está bien puesto en presente simple o pasado continuo lo que esta entre comitas (".."), si no ponerlo bien.)
Thanks!!!!!!