题目

Once upon a time, a hippo（河马）lived in a river next to a big tree． One day，a bird came and nested（筑巢）in the tree．The songs of the bird filled the hippo with so much envy（羡慕）that he couldn’t think of anything else．Every day he would think why he wasn’t born to be a bird even though the bird told him many times he was so lucky to be so big and such a good swimmer．   Finally，the hippo made up his mind that he would come out of the river，climb the tree and start singing．However，when he tried to climb the tree，it was very clear that the hipThese photos              me              the old days when I was young. A. let, thinkB. make, think C. remind, to D. remind, of