. hard Bill is working!-Yes. He’s the most hard-working in our class.*

It’s no use ______ a lot without doing anything.

Wehavemadeafewachievementsintheeducationreform,butmorethingsremain________. [ ]

－Where did you put the car keys? －Oh, I ______ I put them on the chair because the phone rang as I ______ in.

Is this David’s key— No, it isn’t _____.