We__pay anything/The concert is free
a. mustn't b. didn't need c. don't need to

1

Объяснение:

Они не обязаны платить за концерт тк он бесплатный

1) was, were

2) was

3) is

4) were

5) are

во всех позициях грамматически можно использовать и отрицательную форму. 

i want have many money for all peoplei want that people all over the world and my family were healthyi want was a happy