Now I practice the violin____ ____ ____ ____a week.
非金属在一定条件下可以转化为相应的化合物,如:
S+O2 ____; C+O2 ____
—Many people are suffering from the earthquake.
—I see. Food and clothes should be sent to them .
From the ____ (determine) look on her face, I knew she wouldn't change her mind at all.