2. The related word is although ... ...
3. When I first met Xiao Ning, I thought she was a (silent and hardworking) child; Later, after a period of getting along, I realized from her that love can't be given.
4. Two smiles of Xiao Ning are written in the article, namely: 1. The teacher accepted her donation in the activity of offering love to the disabled. This is because Xiao Ning won applause from his classmates.