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24. We use a .................... to measure temperature.

• a. ruler
• b. thermometer
• c. clock
• d. scale

25. Ice melts and turns into water when it gets .................... .

• a. cold
• b. hot
• c. freezing
• d. dry

26. Plants need sunlight, water, and .................... to grow.

• a. soil
• b. milk
• c. juice
• d. soda

27. We must keep our .................... clean.

• a. planet
• b. house
• c. school
• d. room

28. The 3Rs stands for Reduce, Reuse, and .................... .

• a. Repeat
• b. Repair
• c. Recycle