When we got there, he was about to leave, so he only had time to explain _____ to us what he thought of our plan. 

But as the moon gave ________ light, she didn’t dare open a window.

Make sure the gas is turned off after cooking, which would        cause danger to our life.

 I think it was a bit boring to work here because there wasn’t always      much to do.

A society cannot be successful if it throws tradition away, but it cannot be successful ____if we do something to stop progress.