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 __________.

I had just posted the letter when I remembered that I hadn’t _________ the cheque.

I can’t say which type of tea tastes better. It’s just a(n) ______ of personal preference.

One of the characteristics that make me different from many people is my adaptability-I'm_______  and comfortable in new or unusual situations.

“Your homework is all right;          , you can do it better, I think.” said the mother.