Since drug abusers have difficulty＿the addiction, support groups where they can talk about their struggles and find new ways to manage in the world are often needed.

 I can’t buy ________that one.

He didn't ________ what I said because his mind was on something else.

 Being afraid of making mistakes,the little boy ____answer his teacher’s question.

The discovery of the new drug is of great ____ to people who suffer from heart problems.