This question examines the usage of words. First of all, we should understand the meaning of the four words given, and then combine the sentences given to see which word is appropriate. In the first sentence, "I helped more than 300 poor students with my meager income", so it is better to fill in "the grace of dripping water, and repay each other as a spring". (2) In the sentence "I did a lot of work for this, but I thought I had the victory, but I lost to Germany by one vote", it is best to fill in "Fall short".