check on/check/check up on

[angliholic]

I have to check on/check up on/check my schedule to see if I have to get up early tomorrow morning.
When you fry fish, you need to check on/check up on/check each side to make sure it doesn't burn.
After you finish your test, you'd better check on/check up on/check your answers carefully.




Which fits in the above context best respectively? And why? Thanks.

[Barb_D]

Check for each one.

(At least to my American ears.)

[as you know, not a teacher]

[Anglika]

I agree - "check".

[angliholic]

Thanks, Barb and Anglika.