He is __________ as a leader but he doesn’t have _________in teaching.

—Americans spend more on health care than most other people .— You’re right . But a new study shows that life      in the United States is falling .

Teachers have to constantly update their knowledge in order to maintain their professional ________．

There’re more Olympic______ winners per head of population in Australia than in other countries.

The twins are of similar _________ in music, though they are quite different in character.