根据汉语提示完成句子。
We take care of animals and plants. In fact we ________(保护) ourselves.
Please____   ____(查找) the words in the dictionary when you are in trouble.
Cows _______ __________(以…为食) grass.
Xu Xiao taught himself on the _______ (互联网).
I’m not sure            (是否) he will come or not tomorrow.