ung tribal man helped Mrs. Davidsonfind her way back, in return for________medical equipment was offered to him bythe latter.

Some insects_______ the colour of their surrounding to protect themselves.

Did you go with ____________—–Yes, I went there with my father.

下列各句中，没有语病的一句是(　　)

Do you know in ancient China— I have no idea. But I know people once used tree leaves to make paper.