1 . Natalie and Callie, both 13 years old, started raising monarch butterflies for fun in 2020.

But after realizing the monarchs were an endangered species, their _______ soon turned into a serious mission.

They learned that the population of monarch butterflies had _______ since the early 1990s, due to habitat _______ and widespread use of chemicals, which made the milkweeds (马利筋草) the monarchs _______ for their main diet dangerous to eat.

So the girls teamed up with a national nonprofit group to plant a native garden _______ for the monarchs. The garden grew organic milkweeds that _______ and kept the butterflies. To help _______ the locals to sustain the monarch population, they created an exhibition about the monarchs in the local library. They also wanted to put up an educational sign in town, but it _______ a lot. To cover the expense, they set up a stand at the Farmers Market to sell their _______ milkweeds for people to plant. Although the fundraising days were ________, they finally succeeded in earning enough money with their hard work and people’s support.

The team has won the Silver Award for their ________ of taking care of butterflies, but they are not ________ with their work. “Our next step is to cut down on the use of ________ to guarantee a safe environment for the monarchs,” said Natalie. In the award ceremony, their teacher Brian ________, “I am so proud of them for their constant ________.”