this is ____ ,so we must ____ on it.A.a hard work;hard work

this is ____ ,so we must ____ on it.A.a hard work;hard work it's (),so we must().A a hard work,work hard B work hard,har This is a hard work ( )It was ____ that nobody could finish it.A.so hard work B. it is a hard work还是it is hard work It is difficult to m() a language ,so you must work hard. S( )comes from hard work ,so we must work hard. lt is a hard work,but we must finish it.改错 If you work hard now,it is ____ you'll have a bright future. We must ( )(work)hard. he is complaining ____ the hard work ____ his boss A\;to B a Please ____(work) hard at it.