Fill in the gaps with the present perfect or past simple

Fill in the gaps with the present perfect or past simple of the verbs in brackets. 1 The Welsh language ... (be spoken) for about twelve centuries already. 2 The Manx language ... (be spoken) on the Isle of Man up to the end of the 19th century. 3 A hundred and twenty-five Native American languages ... (disappear) up to now. 4 Bruce Connell... (return) to Cameroon, but Bogon, the last speaker of Kasabe, had died. 5 Pre-Columbian people ... (speak) 300 languages at the time Columbus landed in America. 6 Of the 175 or so languages recorded across the Russian Federation, about half a dozen ... (by now / come) to the edge of extinction. 7 When ... the tribe council... (decide) that it would not develop a written form of the language? 8 Linguists found that only 500 Kets, north-west Siberian people, ... (speak) their own language competently in 1993.