Youtube is blocked in China and with a good majority of italki members hailing from China, you're fresh out of luck.

I would say "Good evening ladies and gentlemen" but internet talk is considered the least formal out of all the forms of spoken and written English so anything goes really.

Yes. Since donating blood for money is accepting the fact that you need financial assistance which for some people can be pretty humiliating.

"get your head together" is an idiom and is a command for you to start thinking straight. If your "head" or brain is in many pieces and separated, you're not thinking straight, so "getting your head together" would mean thinking straight and having a mind that is focused.

To be grammatically correct, the second to last and the last adjective that describe a noun needs to be separated with an "and". So the grammatically correct sentence would be "the eccentric and fact based seller...". If you have more than two adjectives, like "the eccentric, abnormal, and fact based seller" you would have a pause between all the adjectives other than the second to last and the last. So in this case, the pause would be put between eccentric and abnormal.

Lashes in the literal sense means to strike something or someone fiercely usually with a whip. However, due to context, lash in the sentence means to hit very hard. Since it is a hurricane, it means that the hurricane destroyed lots of buildings and caused a lot of damage.

Formally, when you're describing the color of something, you need to use “色” after the color or else it will mean something completely different. So the correct one would be "我的猫是黑色的“ and remember you need to add 的 at the end of any sentence using "是“。 “我的绿色的帽子”＝My green hat "我的绿帽子“＝My unfaithful spouse. “色”after the color is very important.