какое из этих предложений активный залог, а какое пассивный:At first the

Какое из этих предложений активный залог, а какое пассивный:

At first the referee thought that it was a joke, but when the player showed at blood on his leg, he had to believe that it was serious.

They began again, but a few minutes later, several players climbed out of the water one by one, shouting that somebody had bitten them.

There was blood on both players legs. The game was stopped, and they began to let the water out of the pool.

When the players returned to their dressing-room after the game, they found a letter there.

I have been a water-polo fan for many years, one of the fans wrote
and I dont like that the game becomes slow and uninteresting, and I have decided to make the players move faster

I dont think I can do this well myself, and I have decided that my crocodile will do it better.