He did not abandon the Dwarves in Mirkwood. He had to help handle the problem of the Necromancer in the south part of Mirkwood. This was necessary because, when he had infiltrated the Necromancer's fortress, Dol Guldur, and found Thorin's father, he had found out that the Necromancer was indeed the Dark Lord Sauron, taking shape again.
Gandalf, along with the rest of the White Council, were afraid that Sauron would take notice of the great Dragon living just to the East of his fortress and form an alliance with Smaug, who was, perhaps, the last of the Dragons with the old fire. And so, while the Dwarves and Bilbo dealt with Smaug, Gandalf and others of the White Council attacked Dol Guldur, only to find that Sauron had fled (presumably back to Mordor, since that is where he is in LOTR).
"The Thrushes are good and friendly-this is a very old bird indeed, and is maybe the last left of the ancient breed that used to live about here, tame to the hands of my father and grandfather. They were a long-lived and magical race, and this might even be one of those that were alive then, a couple of hundreds of years or more ago." Thorin also says that the men of Dale used to understand their language, and used them as messengers. Later, he proves faithful, and aids in the killing of the dragon.
At the unexpected party, Gandalf gives Thorin a map of the Lonely Mountain, which has information about a secret door and the key to the secret door.
He showed them that thorins grandfather had a pairof earings
Gandalf is worried that Smaug may become an ally to the newly returned Sauron.
Umm i think it was fair because gandalf told thoron that bilbo was a burgaler and hes probably the least important to thorin
When? They needed a lot of saving at various times in the Hobbit. However, the usual answer is Gandalf. He saved them from the Trolls and later the Goblins. The Eagles saved them from the wargs and goblins and you might make a case that Beorn and the eagles saved most of the company at the Battle of Five Armies.
{| |- | Gandalf did not give Thorin a gold chain. Gandalf gave Thorin the key that he had gotten from Thorin's father. Thorin then took the key and placed it on a gold chain that he was wearing around his neck. |}
Gandalf only gives Thorin the key and the map (they go together) because they are rightfully his( being given to Gandalf by Thorin's relatives).
Gandalf did, he tricked the trolls into talking until the sun came out and then they turned to stone. :)
Thorin's father, Thrain, gave the key to Gandalf, who gave it to Thorin
With Gandalf and the dwarf Thorin Oakenshield, and his company of twelve further dwarves.
I'm not sure what you mean. Thorin's grandfather never gave Gandalf a mountain. As far as I know, Thorin's grandfather (Thror) died in Moria without ever meeting Gandalf. Gandalf did meet Thrain, Thorin's father, in the dungeons of the Necromancer and Thrain did give Gandalf a MAP of a mountain. And if your question is what is on the mountain on the map that Thrain, not Thror, gave Gandalf, in my edition of the Hobbit, it's a small picture of a dragon. Some of the spurs of the mountain also look like they're on top of it, but it's just a bird's eye perspective.
Thorin Oakenshield, or Gandalf, depending on your perspective.
Bilbo went on an adventure with the thirteen dwarves, Fili, Kili, Balin, Dwalin, Dori, Nori, Ori, Oin, Gloin, Bifur, Bofur, Bombur, and Thorin Oakenshield, and Gandalf the Wizard was with them some of the time, too.
At the unexpected party, Gandalf gives Thorin a map of the Lonely Mountain, which has information about a secret door and the key to the secret door.
Red Wine is what they requested at the Unexpected Party.
He showed them that thorins grandfather had a pairof earings
Gandalf is worried that Smaug may become an ally to the newly returned Sauron.