英语语法以下句子正确吗?
IamanundergraduatestudentandaimtodevotemyselftothesocialsciencedevelopmentinChinaandoptimizing(devoteto后用的动名词形式?)oursocialexistencethroughaddressingsocialproblems.
Ilearnedlotsofdifficultiesconcerningthedisabled,theolds,andcrimeinpersonduring theinvestigation.