Many people and organizations have been making every possible effort in order to save ______ species.
Đáp án A
Endangered species: động vật bị đe dọa.
Ann's encouraging words gave me _________ to undertake the demanding task once again.
In the US the first stage of compulsory education _________ as elementary education.
The local people insisted that the road_________50 cm more so that, in case of flood, they still can travel on it.