New Delhi: The NCP kept the Congress guessing on quitting the Union cabinet as party chief Sharad Pawar and party leader Praful Patel skipped the dinner hosted by Prime Minister Manmohan Singh on Monday evening. Although, the sulking ally had made it clear that it will not rock the UPA boat and continue its support 'till the end'. At stake is the NCP's demand to remove Prithviraj Chavan as Chief Minister of Maharashtra.