3. 每年,许多国家的人们关灯一小时。它告诉人们节约用电。“地球一小时”(活动)在三月的最后一个星期六(举行)。从晚上的8:30到9:30。苏海将会节约用水。当她刷牙的时候她应该关上水龙头。刘涛将不会浪费食物。他应该总是吃光所有的食物。迈克将会节约纸张。他应该使用纸张的两面。这些小事将会从很大程度上帮助我们的地球母亲。
, people turn off their lights for an hour. It tells people to . is on the of . It lasts from 8:30 to 9:30 in the evening. Su Hai will . She should when she brushes her teeth. Liu Tao won't . He should always . Mike will . He should use both sides of the paper. These small things will help our Mother Earth in a big way.

3. Every year; in many countries; save electricity; Earth Hour; last Saturday; March; save water; turn off the tap; waste food; eat up all the food; save paper

4. 王兵正在做一个关于过去生活和现在生活的项目。过去他的爷爷写信给他的家人和朋友们。现在他和他们在网上聊天。王兵的奶奶那时花费大量时间在路上。现在高速列车运行得非常快。在过去，王兵的妈妈在办公室办公。如今她有时居家办公并且开在线会议。20年前，王兵的爸爸去商店用现金付款。现在他经常在网上购物并且在他的智能手机上付款。
Wang Bing is on life in the past and now. In the past, his grandpa his family and friends. Now he them . Wang Bing's grandma on the road then. Now travel very fast. In the past, Wang Bing's mum . Now she sometimes and . Twenty years ago, Wang Bing's dad and in cash. Now he often shops online and pays .

4. doing a project; wrote letters to; chats with; on the internet; spent a lot of time; high-speed trains; worked in an office; works from home; has online meetings; went to shops; paid; on his smartphone

二、根据课文内容和首字母提示，补全短文。
1. Yuan Longping was a C r s. He w b in 1930 in Beijing. He p a in 2021 in Changsha. He did a lot of s o r. People call him the
f o h r. He had two dreams. He wanted to enjoy the c u t r p. He also wanted to see hybrid rice grow a o t w. Yuan liked f at an early age. When he g u, he studied f. In 1964, he b to w o hybrid rice. It was very d, but he never g u. He worked hard and always s in the fields. He d hybrid rice in 1973. Now hybrid rice grows in China and m o c. It f p all over the world.
2. Yesterday was 21st O. It was Grandma's 66th b. We w to my grandparents' house in the morning. My parents g Grandma a nice s. I d a picture for her. We also b a cake. Grandpa and Grandma were so h to see us. We had a big lunch. We a n and w Grandma a l l. Then Grandma b o the c, and we ate the cake. In the afternoon, I c w Grandma. We also t a family p together. We do this on Grandma's birthday every year. This is our 12th photo. Time flies! When I was a l k, Grandpa and Grandma t c of me. Now I am a big boy. I can take care of them. I want to s m t with them.
3. Hello, I'm a cardboard box. I got here in the morning. What will they do with me? Will they t m a? Oh no. In the afternoon, they picked me up and put me in a r b. Then I got on a truck. There I m f with plastic cups, plastic bottles and glass bottles. The truck t us to a recycling centre. The workers there put us into d g. Then I went into a m. There I went to sleep. What a long sleep! Hello again! It's me! Now I'm in a library. Yes, I'm a book now. Children like me very much. How wonderful! Next time, I'll become...

1. Chinese rice scientist; was born; passed away; studies on rice; father of hybrid rice; cool under tall rice plants; all over the world; farming; grew up; farming; began; work on; difficult; gave up; stayed; developed; many other countries; feeds people
2. October; birthday; went; gave; smartphone; drew; brought; happy; ate noodles; wished; long life; blew out; candles; chatted with; took; photo; little kid; took care; spend more time
3. throw me away; recycling bin; made friends; took; different groups; machine