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It is okay to hesitate for a moment or two when it is time to respond. However, it is best to fill as much of the time as possible with your response. If you have a few extra seconds you can sum things up in a short conclusion. You will lose marks for poor pronunciation, so don't try to use big words that you can't say properly. You will also lose marks for improper use of vocabulary and idioms. Make sure you know how to use an expression properly before you try to use it on the exam.