It's necessary that we spend some time after class listening

it's necessary that the problem__in some way or other It's necessary that an efficient worker____his work on time. I still spend some free time listening to the music.It makes It's necessary / important / essential that we (should) clea That's the ____.It's time for class. it‘s time class spend some time, time 能不能加S It is time that we have class改错 it will be necessary that we define with you some particular Every day we should spend some time () 用to listen to或listening to填空：Now,it's time for class.Let's s It's time that we should get up.和It's time that we get up.