If you keep learning English for half an hour each day,your English will be gradually improved.( )
at least
at present
at once
at first
---Could you please sweep the floor? ---___________. I’m washing the shirt.
It’s important for us_____ in good health.
---___________________? ---He’s a headache.
--- Bob, your room is a real mess!--- . I’ll clean it up right away.
---I’m afraid I’ve got a bad cold. ---