7.Reading Fill in the blanks (English Language)

With about one and a half billion non-native speakers, English has become the world’s own language. Such ___________ has its downside, of course. There are now about 6,800 languages left in the world, compared with perhaps ________ that number back at the dawn of agriculture. Thanks in ________to the rise of über-languages, most importantly English, the remaining languages are now dying at the _______ of about one a fortnight. Want to learn Busuu, anyone? Then you’d better head to Cameroon fast, before one of the language’s last eight speakers kicks the bucket (as the Busuu-nese presumably doesn’t say).
Options:
more, reign, relation, twice, part, rate, dominance, margin