Hoàn thành bài tập sau

giúp mình với ạ,:
-Làm đúng cho 100 xu 
-Làm nhanh + 10 xu
-Chấm 5 điểm 
=> 110 xu và 5 điểm

----- Nội dung dịch tự động từ ảnh -----
in a city
megacity
eco-friendly home
smart home
on the sea
under the sea
earthscraper
underground
1. A large city with more than ten million people
living there.
2. The salty wvater that covers a large part of the surface of
the earth.
3. Below the surface of the earth.
4. A place where many people live, with
many houses, stores, businesses,... and which
is bigger than a town.
5. A house which is friendly to environment.
6. Below the surface of the sea.