I'm not the greatest at grammar, but I think the very first one is incorrect. It should just be a comma, then the second just a comma as well, but the last one is correct. (I have no idea, I am sorry if you get it wrong.)
Here are the answers to the given sentences above.
1. It is better to give that to receive.
2. He is the greediest person I have ever met.
3. Some people are more reliable than others.
4. Becky is by far the best student in her class.
5. Most difficult text of all remains to be translated.
6. More money you make, more money you spend.
7. She is the most helpless person I have ever known.
8. The hall is much larger and far more pleasant than the dining room.
9. The weather is getting worst and worst.
10. My older sister is five years older than I am.
11. Glodeni is 150 kilometers farther.
