2.( 1) once, once (2) will, will (3) worry, and even more worried (4).

3.C

4.( 1) I'm from Lushan Mountain, and I have no problem with you. What crime have I committed? (2) In a hurry, I couldn't make sense (or excuse), but I suffered the nectar together.

5. Briefly describe Lu Tong's character and talent.

6. I deeply regret and grieve for Lu Tong's accidental death in Mana.