This is the main use that the scientists make _________ of natural resources.
As the clock struck nine, players ______their positions and the match began.
—Lucy, read this book, I ____ that you’ll be fond of it.—OK. I’ll read it after I have finished my homework.
The air is deadly polluted because some factories don't ________ the rules to protect the environment.
The visiting minister expressed his satisfaction with the talks, ______ that he had enjoyed his stay here.
You should try not to get ________ in the trouble between them.