To learn English well, we should find opportunities to hear English ______ as much as we can.
The scientists are trying to ___ natural energy to decrease air pollution.
China is ___ the east of Asia while Japan is ___ the east of China.
He spoke so slowly that we all could ___ him.
I ___in North China, but now I ___ the weather in South China.
I have no idea __ the Greens has moved to Hangzhou or not.