我真的很擅长科学，但我必须承认，我从来没有真正地喜欢学习科学。
I was really good at science but I must admit I never really enjoyed studying it.
我很高兴我在英语竞赛中获得一等奖，但我也明白我必须脚踏实地继续学习。
I'm very happy about my first prize in the English competition, but I also know that I must keep both feet on the ground and learn more.
与第 (2) 种方案相同，但我一定要学习此课程才能毕业 --我 必须加入这个班。
Same as (2) above, but the class is required to graduate -- I must get into it.
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