I do not know enough about the topic to offer a(n)（）on it.

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• （1分30-35秒）As a rule， if one want to cover the cost he initially buy a house， how many years can be enough？
• This book is not（）enough for him to understand.
• They keep running all the way there as they don’t have enough time.
• He is smart enough to solve this problem.
• The presenter can（）so that the audience have enough time to take notes.