为你解答.
① 在将来一切东西都是免费的.
Everything (will) (be) (free) in the (future).
② 我爷爷希望能活到100岁.
My grandpa hopes to (live) (to) (be) 100 years old.
③ 我相信100年之后,我们地球上的污染会越来越少.
I believe there (will) (be) less and less (pollution) on the (Earth).
④ 很少人知道我们星球正处于极度危险中.
(Few) people know that our planet is (in) (great) (danger).
⑤ 人人都应加入到拯救我们地球的行动中来.
Everyone should (play) (a) (part) (in) (saving) our earth.