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Fill in each of the gaps of the sentences with an appropriate phrasal verb in its proper form. work at work off work on work out work up 1. From where I stand, our commercial banks still need to________ their inadequate customer service system. 2. Communication is a skill that you can learn. It's like riding a bicycle or typing. If you're willing to ______ it, you can rapidly improve the quality of your life. 3. An outburst of anger can damage a good friendship so badly that it takes a long time to heal. Try to______ your anger without hurting anyone. 4. John's idea is perfect, but first we must _______ the details of such a plan. 5. Competing in some sports events is very exciting once you can _______ the courage to go ahead and try.