1. the first one, no; the second one, awkward; the third one, yes. 2. think so. 3. what tv program do you watch? 4. no. 5. 旅游 is for leisure or holidays, but not necessarily when is comes to 旅行.

first of all, you need to separate 可and 下 here, they don't belong to one single word! It might be more clear if you put like this: 这可是 下了 血本 了。 Here 下 means spend/deposit. 血本 means original capital in business (a less fancy explanation) or (it costed them) an arm and a leg (a fancier way to explain). Hope this helps!

待 － to stay 住 － to live/stay/reside

Here it means determined by a specified factor, i.e. product.

I don't actually know how to translate "it was fun" into Chinese, as it's all about the context! For 'I had fun tonight', you can say something like "我今天晚上过得很开心“。When people hear this, they would assume you are saying this by the end of the night, there is no need to emphasise the past tense. It was cold there. -那边曾经很冷 if you really want to emphasise it was in the past, though this is more like 'it used to be cold there'... But again there is nothing wrong if you just say '那边很冷‘ when you are referring to a trip you went on. Hope this helps! Sorry if this is not totally clear...

well you can ask 你常常 （做／去／干） 吗？ or 你多久 （做／去／干）一次？ then I believe the person would give you the sort of answer you want :)

核对--check 确认--confirm