Look! David is helping his mother _______ the room.

 --What         if you don't finish your work on time?  -- Mrs. Brown will be very angry.

Hurry up! Once the concert starts, nobody _______ to enter the concert hall.

— Were you at home at that time?— No, I ______ dinner with my friends in a restaurant.

 — When _________ you________ your teeth, Billy?—Just now.