Choose the correct modal constructions.

Choose the correct option.

Andy and Greta [should become|should have become|should have became] friends in 2019, but they didn't.

They [must were|must have been|must been] on vacation; they're relaxed and tanned.

We [shouldn't have been|should't to be|should have been] rude to the teacher; she's so angry now!

Jeffrey [should have fed|should feed|should fed] the cat, but he didn't.

Alice and Grace [may leave|may left|may have left] for London; I didn't see them yesterday.