Do you know what the Latin in these sentences mean?

1. Because he had not been told in advance he had to make an ex tempore speech at the meeting.
2. In an emergency, make for the exit.
3. After a bad crossing they were glad to be on terra firma again.
4. They won the match 2 goals to nil.
5. People prefer to see wild animals in their natural habitat rather than in cages.
6. divided by 3 is 3.33333 ad infinitum.
7. The club committee discussed inter alia the provision of lunches for members.
8. The pathologist performed a post mortem on the accident victim.
9. He did not beat about the bush but plunged straight in medias res.
10. When children are in school, teachers are in loco parentis.
11. The student received his degree in absentia.
12. He was determined to pay off his debts in toto.
13. The archaeologist examined his finds in situ before removing them to the museum.
14. Above the names of those who had died in the war appeared the words In Memoriam. Their memory should last in perpetuum.
15. She earned £3650 per annum. How much is that per diem?
16. Interest was charged at 9 per cent(um).
17. The footballer was suspended sine die.
18. The school received a per capita allowance to buy books.

And what do these mottoes and sayings mean?

1. quis custodiet ipsos custodes? (Juvenal, a Roman satirist)
2. aut viam inveniam aut faciam (school motto)
3. ascendam (family motto)
4. Deus mihi providebit (family motto)
5. in hoc signo vinces (seen by Constantine the Great in a vision)
6. o tempora! o mores! (Cicero, a Roman orator)