work hard on
work hard on
work hard on和work hard at
是work hard at sth.还是work hard on sth.
work hard at和work hard on 的区别
Work hard so as to finishing the work on time.
work hard on the subject,work hard at English,in your lesson
All the chilldren work hard at还是work hard on our lessons
this is ____ ,so we must ____ on it.A.a hard work;hard work
work hard
play hard-work hard
work hard at hard
Our s______ depends on our hard work,perseverance and determ