Что такое конкуренция? Какова её роль в экономике?

1) Listen! Somebody (is singing)
2) We usually (do) our shopping in the afternoon
3) I ( live) in Tomsk, it is my home-town.
4) My sister sometimes (reads) German magazines
5) Nobody (is watching) TV now

1) is singing
2) do
3) live
4) reads
5) is watching