More and more carbon dioxide is being released into the air,________the more severe global warming effects.
Only then ______ how much damage had been caused.
—How long will you be staying?—I don't know.______ .
The ______ on his face told me that he was angry.
_____ we stood at the top of the building,we were able to enjoy the town below clearly.
After he ______ the table,he sat down on the sofa for a rest,waiting for his guests.