In San Francisco, there is a special group of volunteers. They call themselves Friends of the Urban (城市的) Forest (FUF). These volunteers want to {#blank#}1{#/blank#}. Every year, the FUF plants nearly 1,000 trees.

The FUF welcomes new volunteers all year round and in all parts of its work. On Weekend Planting Days, FUF volunteers work with common citizens (市民) to plant trees. The planting usually runs from 9 a.m. to 1 p.m. After the work is done, everyone {#blank#}2{#/blank#} over a community lunch.

On Thursday Planting Days, the FUF plants "replacement (替换) trees". As their name suggests, these trees replace trees {#blank#}3{#/blank#}. Planting Leaders are very experienced volunteers. They are able to help other volunteers at planting events. Planting Leaders usually wear a special FUF T-shirt. Some new volunteers know little about "replacement trees". They can easily find Planting Leaders and {#blank#}4{#/blank#}.

Hello! My name is Sara and I'm thirteen years old. I'm from France. My best friend is Mary. She is from Germany and one year older than me. She came to France with her family five years ago. At the be- ginning (开始) she couldn't speak French well but now it's different. She's very hard-working at school and she's fluent in French now,

Mary is tall and beautiful. She has long curly brown hair and brown eyes. We are in the same school and she lives not far from my home. We often go home together. After school we also spend some time together. Because I'm better at math and science and she is better at history and geography, we can always help each other with our homework. She also likes reading very much. Last year she won a special prize (奖) for the best reader in our class.

My friend is not very sporty. She doesn't like team games(团队运动)but she likes swimming. I like sports and we go swimming together every Saturday morning. She's a little shy with new people but with me she's friendly! I like her and she always brings out the best in me. I really hope we can be best friends for life!