My heart was beating fast when I start to make the speech. I had prepared very good but it was the first time for me to speak to so many student in the public. So I was very nervous when I began to speak. Luckily, the whole room was so quietly that I could easily make myself hear. After a while I became confident than before. Everyone listened carefully. I could see from our eyes that I was doing a good job. As soon as I finished speak, the students applauded. How an unforgettable experience!start改为started
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(答案→)start改为started
解析：
【小题1】发生在过去的事情，故用一般过去时。
【小题2】需要用副词修饰动词prepared。
【小题3】many修饰可数名词复数，所以student 改为students。
【小题4】in public是固定用法，意思是当众。
【小题5】用形容词作表语。
【小题6】这里想说“使我自己被听到”，所以hear 改为heard。
【小题7】根据than，所以confident 前加more。
【小题8】这里想说我可以从他们的眼睛中看出，所以our 改为their。
【小题9】作宾语，所以speak 改为speaking。
【小题10】experience是名词，所以How 改为What 。