--- I’m afraid it’s going to rain this afternoon.--- ______ Look at the dark and cloudy sky.
The question _______ we can get enough coal for the winter has not been cleared up yet .
Every possible means ________ to prevent the air pollution , but the sky is still not clear.
Some people thought ________ possible to live on out space in the future .
_____his poor health ,he was still at work late into the night.
I don’t think that rock music is terrible , ______?