when the sun shines t____ rain,a rainbow is formed in the sky.空格给出首字母,请问该填什么单词?

when the sun shines t____ rain,a rainbow is formed in the sky.空格给出首字母,请问该填什么单词?
when the sun shines t____ rain,a rainbow is formed in the sky.The best rainbows are formed when the sun is l___ in the sky,in the morning o___ in the evening.when you look at a rainbow,you will n___ that the sun is always behind your back and that your shadow p___ straight to the middle os the rainbow.you can n___ see a rainbow if you face the sun