Sure, here are the corrections for each sentence:

1. My sister **have** rights to **choose** which **charity** to **join.**
- **A**: "have" should be corrected to "has" because "sister" is singular.

2. Every month, we **collect** old **book** and **clothing** to **aid** impoverished mountain children.
- **B**: "book" should be corrected to "books" to match the plural form of "clothing."

3. Mark **prefers** to volunteer because he **believes** it is **benefit** and **valuable** to society.
- **C**: "benefit" should be corrected to "beneficial" to match the adjective form.

4. The students **tutor** youngsters from **low-income** homes to provide them with the **necessary** knowledge to **obtains** a decent job and a good life.
- **D**: "obtains" should be corrected to "obtain" to match the infinitive form.

5. I **didn't** **see** Jeremy today, but I **saw** him **in** Sunday last week.
- **D**: "in" should be corrected to "on" because we use "on" with days of the week.

So, the words or phrases that need correcting are:
1. A
2. B
3. C
4. D
5. D