Birds k____on cage doors with their beaks when they are hungry.This bottle is e_____.Please give me a full one.

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Birds k____on cage doors with their beaks when they are hungry.This bottle is e_____.Please give me a full one.
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Birds k____on cage doors with their beaks when they are hungry.This bottle is e_____.Please give me a full one.
Birds k____on cage doors with their beaks when they are hungry.
This bottle is e_____.Please give me a full one.

Birds k____on cage doors with their beaks when they are hungry.This bottle is e_____.Please give me a full one.
1:KNOCK vi.敲;打;敲击
vt.敲;打;敲击;批评
2:empty 空的;