I am sorry to learn that you have made no (improve)（）on the design at all.

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• My teacher said that she would give me a(n)（）to improve my mark by doing the assignment again.
• Specialists will be invited to （）our present system before we try to improve it.
• Since 1980s, people have studied how to improve the information （） of barcode symbol.
• In order to improve（）at the interface, the surface of the（）must be treated.
• herbs can be used to help the patient to improve and promote blood circulation.