She is very good at playing ___ piano and now she is teaching ___ piano at a music school.
Completing all the homework by the dinner, John felt very tired. He __________all day long.
Though working outside, he is always ________ about his aging mother at home.
-------The weather is terrible now; our earth is badly damaged!-------Yes. It’s urgent that everyone _________ spare no effort to do something to save our world .
Because the writer fell ill all of a sudden, the novel _____________ by the end of next month was put off.
The young dancers looked so charming in their beautiful clothes that we took _________ pictures of them.