can't activate certain quests

Krabappel Apartments
Bart/Milhouse/Martin go to Library (24 hours each). (Olive Branch Pt. 2)

Springfield General Hospital
Hibbert perform surgery (24 hours) (Operation!)

Burns Manor
Comic Book guy prompts Smithers to:
Write Malibu Stacy news letter (6 hours) (Executive Lackey Pt. 4)
Whip it (8 hours)(Executive Lackey Pt. 4)

Ralph Wiggum House
Ralph prompts Lisa to work on her blog (24 hours) (This Little Wiggy Pt. 5)

I can't seem to activate this quests even tough they are all free from work?