由于上学期考的分数不好，暑假我不得不复习我的功课。
I have to review my homework this summer holiday because of my awful marks last semester.
由于上学期考的分数不好，暑假我不得不复习我的功课。
I have to review my homework in the summer holiday for I don't get good grade last term.
由于上学期考的分数不好，暑假我不得不复习我的功课。
I'll have to review my lessons as a result of the bad grades last semester.
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