Поставь предложения во множественное число. образец: it's a sandwich. they are sandwiches.

1 - c2 - a3 - f4 - e5 - b

6 - d 

everyone agrees that unless tiger population is protected ,they will become extinct.if it were not the efforts made by international campaigns the extinction would already have become a fact.it is time to cooperate and help to animals otherwise the future will be sad.supposing there were no tigers left in the world: how would we all feel? !