1 . A ban on Tiktok may not give rise to the ______ (disappear) of Chinese apps in America but open the door to them. (所给词的适当形式填空)

2 . Many species of animals and plants __________in the past decade, which makes us reflect on what it is that causes their __________. (disappear) (所给词的适当形式填空)

3 . Why are the animals in danger of ________ (appear)? (所给词的适当形式填空)

4 . It is unlikely, however, that this fragmentation will lead to the ________(disappear) of English as a language understood around the world. (所给词的适当形式填空)