Нужно поставить слова в нужном порядке, чтобы получились предложения : to/people / have/moon/travelled/the ? walked/ mars /on/ people / have? the/has/changed /climate? we/ environment /the /have /protected? pollution / trees /has /a lot of / destroyed? stayed / the/ has/ same/ world/ the?

Have people to travelled the Moon?
Have people walked on Mars?
Has the climate changed?
Have we protected the environment?
Has a lot of trees destroyed pollution?
Has same the stayed the world?