主題：Clean a Penny

班級：S-6

單字：vinegar(醋), salt(鹽), bowl(碗), penny(一分錢), pour(倒), stir(攪拌), wait(等待), watch(看), remove(去掉), acid(酸)

句子：

1. What do we need for this experiment? (We need……)
2. Will other acids like lemon juice work as well? (Yes, they will./No, they won't)
3. Did this experiment clean the coins? (Yes, it did. / No, it didn't)