The following sentences have certain presuppositions that ensure their appropriateness. What are they?

Presuppositions

The following sentences have certain presuppositions that ensure their appropriateness. What are they?

Example: The minors promised the police to stop drinking.

Presupposition: The minors were drinking.

1. It is an atrocity that the World Trade Center was attacked on September 11,2001.
2. It isn’t tolerable that the World Trade Center was attacked on September 11,2001.
3. Mary drank one more beer before leaving.
4. Jack knows who discovered Pluto in 1930.
5. Mary was horrified to find a cockroach in her bed.