[解析]
Hanging her head down,Ruby felt so regretful for getting Ollie into trouble.She realized it was her fault that put them into such a shameful situation. "I am so sorry that I'd like to make a sincere apology to you.【高分句型一】" Ruby said to Ollie with tears rolling down her cheeks.Hearing this,Ollie felt ashamed with his cheeks burning and said, "I should also take the responsibility for the matter.To make up for this fault,I will try my best to help you." Ruby wiped her tears and was determined to spare no effort to learn maths with Ollie.(描写了Ruby道歉以及决心弥补)
Ollie proved to be a good teacher for Ruby.He was always ready to help whenever Ruby met with difficulties.As time went by,with the assistance of Ollie,Ruby gradually made great progress in maths.Eventually,they both got full marks in the final examination once again.The headmaster praised them for the progress they had made.It was at the moment that they really felt proud of themselves.What an unforgettable and meaningful experience,which taught them a lesson of honesty and true friendship.【高分句型二】(描写了Ruby在Ollie的帮助下,数学取得进步,最后两人都得了满分)