横线上填什么?Plants grow well in spring and summer b_1_ the weather is warm with a lot of water.

横线上填什么?Plants grow well in spring and summer b_1_ the weather is warm with a lot of water.
When autumn comes,the weather becomes cool and dry.Plants grow s_2_ in autumn.Some may even die before winter comes.But some plants can live in winter.In autumn their leaves t_3_ yellow and fall off,so they can lose l_4_ water through the leaves.When spring comes,n_5_ leaves will grow out.