Label each group of words s for sentence or cf for clause fragment

because we discussed the topic of the test in great detail.

choosing fresh fruit as a snack is a good idea.

that she was the only one who came made a huge difference in our plans.

until miguel stops caring about the work he is doing.

since the president has traveled to many south american countries.

(1) Doesn't make sense alone. When a sentence starts with because it must have have a completed idea after the comma. EX: Because we discussed the topic of the test in great detail, you should past the test. (This is correct because the completed idea is connected after the incomplete idea with a comma) Therefore the first group of word is a CF

(2) Makes sense. If I was to say this out loud then to a friend then the response wouldn't be "what's next?" It is a complete idea as it doesn't have a conjunction and doesn't sound incomplete. So it is S

(3) Doesn't sound right out loud. I'm leaning towards CF since the sentence starts off with the word "that" which makes it sound not correct.

(4) Again, this doesn't sound good out loud. Until what? It is a incomplete idea. If it said "Until Miguel stops caring about the work he is doing, he will always get As in class" then it would be complete because a independent idea is connected by a comma. So this is CF

(5) Since is a conjunction meaning it can connect a complete with a complete idea or starting at the beginning followed by a comma. EX: Since I quit the school's band, I can no longer play my instrument. & She hated broccoli since it tasted weird to her. This set of words doesn't have a complete idea with it. It only has an incomplete idea so the answer is CF

I hope this help but just in case you may want to check the answers with your teacher as #3 sounds "eh" to me.