根据下列句子及所给单词的首字母，在答卷上按题号写出各单词的完全形式 。
⑴Yesterday I a____  with my best friend, so now I want to say sorry to her.
⑵He r____ his bike to school yesterday.
⑶My mother waters f____  every morning in the garden.
⑷We started classes an hour a____ .
⑸Lu Xun is one of the greatest w____  in China.
⑹Would you mind t____  down the music? I want to sleep.
⑺Please wait in l____ , or others will be annoyed.
⑻Horse is a u____  animal for people in the old time.
⑼Goldfish are easy to take c____  of.
⑽I bought a new bike and it c____  me five hundred yuan.

在“探究外力做功与动能改变的关系”实验装置如图甲所示：

实验室用的药品有的有毒，有的有腐蚀性．为了安全在实验室使用药品时应做到“三不”：不能 ____，不要 ____，更不能 ____．

下图为自然界碳、水物质循环示意图。读图回答题。