用动词的适当形式填空。
小题1:He would like to be a social worker when he_______ (grow) up.
小题2:The Eiffel Tower is_______ (make) of metal.
小题3:He needs_______ (meet) his close friend.
小题4:They_______ (plan) to go to see the final, but they didn't.
小题5:We are writing to you about_______ (protect) wild animals.