Choose the correct verb in the following sentences (0 = nothing)

I can't go out yet, I'm waiting ... an important phone call.
1. for
2. to
3. 0
4. on
You're always asking me ... some change. Can't you ask someone else this time?
1. for
2. to
3. 0
4. on
I've decided not to apply ... that job I saw advertised.
1. for
2. to
3. 0
4. on
We discussed ... many important questions during the meeting.
1. to
2. on
3. 0
4. about
Ged likes his job but he doesn't talk ... it much.
1. of
2. 0
3. about
4. for
He's so selfish. He doesn't care ... anyone except himself.
1. of
2. 0
3. about
4. for
I looked ...my keys everywhere but I couldn't find them anywhere.
1. at
2. up
3. after
4. for
That wall doesn't look very safe. I think we should do something ... it.
1. for
2. 0
3. about
4. on
My grandfather cared ... my grandmother when she was sick.
1. to
2. for
3. 0
4. on
My grandfather took care ... grandmother when she was sick.
1. of
2. to
3. 0
4. on
Don't worry about a thing. I'll look ... all the arrangements.
1. around
2. on
3. to
4. after