Here are the odd ones out for each pair:

1. **A. Vietnamese** (B. Japanese is also a nationality)
2. **B. until** (the others are adjectives)
3. **C. last night** (the others are words indicating relationships or locations)
4. **A. her** (the others are names or pronouns)
5. **A. arrive** (the others are verbs related to communication or transmission)
6. **C. hers** (the others are possessive pronouns, but "hers" is not used to refer to an object itself)
7. **D. netiquette** (the others are general adjectives)
8. **C. beautifully** (the others relate to adverbs that have a more immediate impact)

So the odd one out for each set is:
1. A
2. B
3. C
4. A
5. A
6. C
7. D
8. C