Well, the simplest example: "He killed." There's also: "The murderer had to kill in order to be happy." "In the animal kingdom, you either kill or be killed." "The psycho chose to kill using only a piece of rope." I'm not too familiar with formal grammar terms but I did a google search for "intransitive verb" and I think these are at least close examples. These were kind of hard to think of because it wouldn't be a common usage of "kill" anyways. Generally you would say "killed him/her/them"

Actually there is a situation in which "I have my haircut this morning" is correct. First, it would have to be haircut (the noun) instead of hair cut (which is an object verb pair). Then, it would have to be morning time too. In this case, the meaning would be "this morning, I have a haircut appointment" However, as written, "I have my hair cut this morning" is incorrect. My immediate reaction was "I had my hair cut this morning" as in "[it is no longer morning and] my hair was cut in the morning"

1) "It's leaking in the faucet" would mean something is leaking and entering the faucet (not exiting), so that's probably not what you meant. "The faucet is leaking" is correct. 2) There's not much difference. In all the examples that I can think of right away, you can use either. 3) I wouldn't say "being worried is happiness" because it sounds like the person being worried is also the person that should be happy. I'm not sure if there's a simple way to express what you want to in English. I might say "I'm happy to have someone that worries about me" but it would depend on who I'm talking to.

"The car fits the space" has the meaning "the car is a suitable size for the space" instead of "the space is a suitable size for the car." It's a subtle difference but I think it's important to note. The sentence "Do you think the trunk fits all the luggage?" makes perfect sense if you're asking "is there enough space in the trunk for all the luggage?" so I would say you've got the meaning down well. In case you wanted to know more about "fit": When using "fit" as in "suitable," context can provide more meaning than just space too. For example, "those clothes fit you well" could mean they're the right size, or that they look good. If you wanted to be more explicit that they look good, you could add more detail such as "Those clothes fit your style" To explain the other examples, "pick an envelope that fits everything" changes to "pick an envelope that is suitable for everything" and then you have to think in what way could an envelope suit everything: it's big enough. "My car fits into that space" is a little different because of the added word "into" which reverses the subject and object (sorta). So you can change it to "That space fits my car" and that to "that space is suitable for my car" and how is it suitable? It's big enough. I'm reading this and it sounds kinda confusing so sorry! If you want a better explanation and examples just lemme know and I'll think of some tomorrow

granted = given to grant is to give (usually in a formal manner) guarantee = ensure to guarantee is to make sure that something happens "to take ______ for granted" is an idiom that means "to treat ____ as though it has been given" or in other words "to not fully appreciate ________"

"I am his fan" good "I am a friend of his" good, also "I am his friend" "I am an Ellen fan" I wouldn't say this "I am a fan of Ellen" good "I am Ellen's fan" okay.. probably would change to "I am one of Ellen's fans"

Any of your answers seem okay to me. I would probably say "the strap fell off" and "I need to reattach the strap" or "I need to tie the strap" (if I'm going to make a knot) I probably wouldn't say "thread the strap" although the meaning is still clear in most cases.

There's plenty of GRE word lists online. For example, https://quizlet.com/14840887/500-practice-gre-vocabulary-words-flash-cards/ I would suggest using the memrise site and finding a GRE or SAT word list on there