The sky over big cities is f_____ with smoke because of car .

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The   sky   over   big    cities   is   f_____   with   smoke  because  of  car .

The sky over big cities is f_____ with smoke because of car .
The sky over big cities is f_____ with smoke because of car .

The sky over big cities is f_____ with smoke because of car .
filled:
be filled with:充满