One you_____drugs, it’s hard to manage to get rid of them.

Without my glasses, I couldn’t       whether that figure on the blackboard was a three or an eight.

3.Once one’s desire ______ reason, trouble is sure to follow. 

The two sides have reached a partial agreement, but several differences still 　　　________ between them. 

The scientists are now trying to discover what use could be ________ such material.