London underground railway + Coral reefs

(noun) traffic jam = ...

Hint: this word starts with letter "c"

(noun) the fact of allowing fresh air to enter and move around a room, building, etc.

Hint: this word starts with letter "v"

What is this animal?

• coral

• oysters

• sea urchin

• clams

(noun) a path that forms a circle around an area (chu vi, đường vòng quanh)

Hint: this word starts with letter "c"

Who is he?

Hint: this word starts with letter "f"

(noun) a situation in which people, groups or countries disagree strongly or are involved in a serious argument

Hint: this word starts with letter "c"

(noun) another option, another remedy

Hint: this word starts with letter "a"

(noun) a law, a rule or a theory that something is based on (nguyên tắc)

Hint: this word starts with letter "p"

to support something publicly

Hint: this word starts with letter "a"

Can you give me a word with the same or similar meaning to "advocate" (noun)?