We must work hard,or we'll( )

We must work hard,or we'll( ) We must ( )(work)hard. We must study hard,so/but/and/or we'll fail in the exam. We must work hard together是什么意思 S( )comes from hard work ,so we must work hard. As students we must work hard our lessons.We it's (),so we must().A a hard work,work hard B work hard,har we must work hard to i____ our teacher We must have to work really hard from now on. In the future.We must work hard的意思 we什么work hard ONLY WE HARD WORK