Viết lại câu sao cho nghĩa không đổi

1.Clement Clarke Moore wrote the poem in 1823

=>The poem...

2.he said, "can you speak English, Nga?"

=>he asked...

3.it is three years since I last saw him.

=>I haven't....

4.keeping the environment clean is very important

=>it...

5.please don't smoke in the kitchen

=>would you mind....