The patient was in bad need of operation but there was no guarantee(保证) that she would survive the anaesthetic (麻醉剂), which made the doctors on the horn of a __________.

—What do you know about Bill Gates?—As far as I know，when he was a child，he showed a________of interests in everything around him. 

Ms Liu saw a fashion dress in a shop which set her heart racing. However, its price was far beyond her _______. 

The children all look forward to _______ the carnival next week.

It is a good plan in theory, but it remains _______ whether it works in practice.