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同学你好~
This year, competition was set at the harvesting scene.
缺少冠词
修正：This year, the competition was set at the harvesting scene.

The appearance of the six competitors who were very fat.
句子结构不完整，缺少谓语动词。
修正：The six competitors were very fat. 或 The appearance of the six competitors was very fat.（但第一种更自然）

They marks were quite close and all very confident to win the last victory.
They marks → 主谓不一致，应为 Their marks（他们的分数）。
confident to win the last victory→ 搭配不当，应改为 confident of winning the final victory。
修正：Their marks were quite close, and they were all very confident of winning the final victory.

It was not long before, weighted and served.
句子结构混乱，缺少主语和逻辑连接。
修正：It was not long before the macaroni was weighed and served.

a huge quantity of macaronis prepared were put on the table.
macaronis → macaroni（不可数名词，不加-s）。
prepared were put → 语态混乱，建议改为 had been prepared and put。
修正：A huge quantity of macaroni had been prepared and was put on the table.

As soon as bell had rung,competition began.
bell had rung → 缺少冠词，应为 the bell had rung。
competition拼写错误（多了一个 i）。
时态问题，had rung（过去完成时）通常用于强调先后顺序，但这里简单过去时即可。
修正：As soon as the bell rang, the competition began.

a large of crowd people surrounding around watched them and shouted out 'cheer up' for them.
a large of crowd people→ 表达错误，应为 a large crowd of people。
surrounding around → 重复冗余，只需 surrounding。
shouted out 'cheer up' → 搭配不当，cheer up是鼓励某人振作，这里应改为 cheered for them。
修正：A large crowd of people surrounding them watched and cheered for them.

Competition rules provided that speed was not important , but quantities.
Competition → 缺少冠词，应为 The competition rules。
quantities→ 比较对象不一致，应改为 quantity与 speed 对应。
修正：The competition rules provided that speed was not important, but quantity.

Three hours later, the only one left, it was just Signor who asked for more,
the only one left, it was just Signor→ 结构冗余，可简化。
Signor→ 如果是名字，首字母大写；如果是称呼（意大利语的“先生”），应为 signor（小写）。
修正：Three hours later, only Signor was left, and he asked for more.

He won the champion at the end.
won the champion → 搭配错误，应为 won the championship 或 became the champion。
修正：He won the championship in the end.

祝同学学习进步~