IT'S ALL LATIN TO ME II

The following phrases are English translations from Latin. Can you supply the original Latin phrases - which are often themselves used in conversational English?

1. Around, approximately
2. In fact, in reality
3. From the library of
4. For each person
5. In and of itself
6. This for that (as favors)
7. Essential
8. Solid ground
9. Word for word
10. Unwelcome guest

Answers:

1. Circa
2. De facto
3. Ex libris
4. Per capita
5. Per se
6. Quid pro quo
7. Sine qua non
8. Terra firma
9. Verbatim
10. Persona non grata