Hello，boys and girls，do you have such an unpleasant 1. (經(jīng)歷): you were away from home for a few weeks，and your lovely plants died because no one watered them. 2. (幸運地)，I will tell you a useful way to solve it.Well，listen 3. (仔細地)．

First，prepare a bottle，and 4. (填充)it with water. Then 5. (覆蓋)the mouth of the bottle with your hand tightly.And turn it upside down.Make 6. (確保) the water does not flow out.Then put its mouth into the soil under the plant.Remember to keep the mouth about 3cm into the soil.When the earth around the mouth gets 7. (潮濕)，the air can not get into the bottle easily and the water will not flow out， 8. (也不)．In this way，the water can seep(滲入)into the earth，watering the plant for quite a few days automatically.Surprisingly，in warm days，you can see more bubbles(氣泡)in the bottle.Why？Because a plant needs more water in warm days.So more water gets into the earth and more air takes the 9. (位置)of water in the bottle.As a 10. (結(jié)果)，you can see more bubbles.

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