:We're going camping in the forest this weekend. What shall we do then?

:Let's go hiking and collect leaves.

:Sounds great! I want to ____stars(星星)at night，too. That's beautiful.

:I'd like to take some ____. There're many flowers in the forest.

:Good idea! But first，we should ____the tent on the grass. And l want to catch fish in the river. Because your mum ____eating fish.

:Thanks，dear! And we can build campfire and cook fish ____our tent.

读下图，回答。

为了加强水土保持，甲、乙、丙、丁四地段中，最应退耕还林（草）的是（　）

在等差数列$\left\{a_n\right\}$中，$a_1=8,a_5=2$，若在每相邻两项间各插入一个数，使之成等差数列，那么新的等差数列的公差是（   ）

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