Choose the correct answer.
Language is the normal way humans communicate. Only humans use language, though other 
animals communicate through other (---1---). Human language has syntax, a set of rules for 
connecting words together to make statements and questions. Language can also be (---2---), by 
adding new words, for example, to describe new things. Other animals may inherit a set of calls 
which have pre-set functions. Language may be done by speech or by writing or by moving the 
hands to make (---3---). It follows that language is not just any way of (---4---). Even some human 
communication is not language. Humans also use language for thinking. UNESCO says that 
2,500 languages are at risk of (---5---) extinct. 
though        گرچه
 syntax   نحو؛قواعد؛ دستور زبان
 inherit     به ارث بردن
calls      نداها؛گفت و شنودها؛درخواست های ارسال امداد
pre_ set   از پیش تعیین شده
functions  وظایف؛نقش ها ؛ کارایی ها
speech  گفتار؛ سخنرانی؛ قوه ی ناطقه؛ سخن
follow  درک کردن ؛استنباط کردن؛ پیروی کردن؛
                                        (2.5 نمره)