Australians use English as their mother tongue so they are native speakers.

A. Australians are native speaker although they use English as their mother tongue.

B. Australians are native speaker because they use English as their mother tongue.

C. Australians are native speaker though they use English as their mother tongue.

D. Australians are native speaker owing to they use English as their mother tongue.

Tiếng Anh 8 - Unit 8: Writing