The pre in preview means that the students were able to see the movie before it actually came out.
The key to maintaining a strong friendship is trust and communication. Youre friends with someone because you two have something in common or simply get along. Trusting and being able to be trusted leaves less room for problems. If problems arise talking it out usually clears up misunderstandings.
It establishes a mournful weeping tone
It would be the third option because inextricably basically means can not be separated or detangled and the sentence is basically saying how because they are sisters , their memories are always linked to eachother
