As is well-known to all,Claude’s work had a major           on generations of musicians.

Being aware of the__________of the disaster, some famous stars organized a charity concert to raise money for the victims.

The old man kept on studying Chairman Mao’s ___ in his ___.

These young people are now making an active ______ to beautify our city. 

Teachers have to constantly update their knowledge in order to maintain their professional(专业的)_______.