作业

homework; work; task; job; schoolwork; operation; production; assignment; operate

认真

serious; earnest; conscientious; intense; studious; careful; precise; heavy; sober; heavy-duty; hard; severe; take seriously; swallow; seriously; earnestly; deeply; religiously; head-on; seriousness; earnestness; diligence; in earnest; in all seriousness; for real

按时

on time; on schedule; punctual; scheduled; punctually; duly