【Language Focus】
Warmth in Volunteer Work
Volunteer work has brought endless warmth to our community for three years. Our community volunteer team has existed since 2022, and it has helped over 200 people in need so far. I have been a team member for one year, ever since I met Ms Li, a warm-hearted volunteer aunt, in the summer vacation of 2025.
Ms Li has volunteered in our community for five years. She has helped the lonely elderly with daily housework since she moved here. Every weekend, we have cleaned the community park for two hours, and we have taught the left-behind kids in their studies since last semester. My deskmate Lily has been on our team since last month, and she has sung old songs for the elderly in the community nursing home for four weeks.
All of us have realized the true meaning of giving since we started volunteering. We have learned to care for others and work together with teamwork for these days. This small volunteer team has become a warm harbour(港口) for everyone in the community, and we know we will keep going, for kindness is always worth spreading.
任务一:根据短文内容，用for/since补全下列句子。
1. Volunteer work has brought warmth to our community three years.
2. Our volunteer team has existed 2022.
3. I have been a team member one year.
4. I have known Ms Li the summer vacation of 2025.
5. Ms Li has volunteered here five years.
6. Ms Li has helped the elderly she moved here.
7. We have taught left-behind kids last semester.
8. Lily has sung old songs for the elderly four weeks.

1. for
2. since
3. for
4. since
5. for
6. since
7. since
8. for

本题考查现在完成时中for与since的用法区分：1. for 后面接表示一段时长的短语，用于说明动作持续了多久；2. since 后面接过去的时间点，或者描述过去动作的从句，用于说明动作是从哪个时间点开始的。结合短文内容和上述规则即可补全所有句子。