一天早晨，小明上学时先以速度V₁走了路程的2/5，因感觉时间紧张，为避免迟到，小明紧接着以速度V₂跑完剩下的路程。则小明这天在上学路上的平均速度为____ 。

    The Bamboo Train, or “Norry” in the local language, is quite famous in Cambodia. The train is in fact a big bamboo bed with four wheels and a small engine. It can run at the s____ of up to 50 km/h on the tracks. Lots of v____go to Cambodia to enjoy the Bamboo Train ride. They have to pay 5 dollars per person to g____on the train. The best time to take the train is from 4 to 6 o'clock in the afternoon, b____it is cool when people enjoy the countryside view. “It feels more like a roller coaster, but it's really nice,” a Germany tourist Theresa Kessemeier said after she c____a ride. The Bamboo Train has become a popular tourist at action.

小明在探究“凸透镜成实像时像距与物距的关系”的实验中，所用的实验器材有：光具座、凸透镜、光屏和蜡烛等。

语法填空

    I was raised in New York City where it's very cold every winter. In the sixth grade, a teacher offered ____ (bring) some students to a homeless shelter after school. I went with my friends and the teacher for several weeks. ____, I continued to volunteer to help when they stopped going together. Because I was good ____ sewing, I was told to help out with the sewing kit when any guests needed some repairs. Throughout high school I continued to come each week after school, setting up my sewing kit which ____ (grow) larger and larger. I got to know the guests who came ____ (regular).

    Later on, I started ____sewing club with my friend and we taught ____ (we) fellow students how to sew. We made heart-shaped pillows for sick ____ (child) and the elderly. Every time it rained I would think about the umbrellas ____ (design) before. In the future I hope to continue helping others as much as I can. It is the most important thing I____ (do) ever since.