About English idioms "Time hangs heavy on my hands" How often do native speakers use this expression in dairy conversation?

I wrote about culture of my country. I'm wondering if this is OK with native speakers to understand The things you should keep in mind as a foreign student in a Korean university is that there are a strict seniority and junior relationship among the students in the same department. For example, you always have to answer the seniors with honorifics. The same is true of university clubs. The person who joined the club first becomes your senior. In addition, Korean students often gather together to drink. They often have a custom of having their drink cups pass to their colleagues and have them drink. This seems unsanitary to Westerners. In Korea, however, it is considered an act of ignoring if you don’t take drink cup that he/she gives to you. You do not have to use it if you do not want to use cups that others have just used. If you have enough courage to ignore some unsanitary aspects of it, you can use the cup.

Which one is more common? The landlord will kick the tenants out of the house if they don't pay the rent. Do you use "eject" or "evict" in that case to kick them out? Or either is ok?

How do you call a person? How do you call a person. When her name is Nicole Wheels, should I say, "Hi, Nicole." or "Hi, Wheels" I think Wheels is her family name. And if her name is Susan Wang, how would I call/address her? We say Mike for Michael Jackson and we say "Trump will talk to Kim jung un" not "Donald will talk to him." And how about Emma Watson? Hi, Emma or Hi Watson? I think either is ok but how about Prince Harry. I think I must say Hi Hi Harry.. If I say "Hi, Prince" is somewhat awkward. How do English speakers use their first and last name?

Can I call lesbian a gay couple? As far as I know, homo sexual between girls is called lesbian, but can they also be called gay?

It's grammar question, and it's very hard to answer for me. Change the word "scarce" into the noun form and rewrite the sentence so that its meaning is not lost: Will funds be scarce for research this year?