Air pollution poses a____________to both human health and our environmen.
Đáp án D
“threat to st”: mối đe doạ, mối nguy hiểm cho cái gì
Ô nhiễm không khí đe dọa đến sức khỏe con người và môi trường
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.