Answer:
1. Mrs. Tremont has several c. students who love her science class.
2. Several of her a. students' projects won ribbons at the science fair.
3. One b. student's invention was awarded the first place trophy.
Explanation:
The general rule is that the possessive of a singular noun is formed by adding an apostrophe and s, whether the singular noun ends in s or not. The possessive of a plural noun is formed by adding only an apostrophe when the noun ends in s, and by adding both an apostrophe and s when it ends in a letter other than s.
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