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.

A. Both New Zealand and Australia has sea around it.

B. There is no sea around New Zealand and Australia.

C. New Zealand and Australia don’t have sea.

D. We can’t go swimming in New Zealand and Australia.

A. Don’t study tourism.

B. To study tourism is not fun.

C. It is not a good idea to study tourism.

D. Studying tourism is interesting.

A. Due to being a developed country, Singapore is not polluted by industry.

B. Despite being a developed country, Singapore is not polluted by industry.

C. As being a developed country, Singapore is not polluted by industry.

D. By being a developed country, Singapore is not polluted by industry.

A. It has been two months since the last time he got his hair cut.

B. He will never get his hair cut again.

C. Getting his hair cut is expensive.

D. He is so lazy to get his hair cut.