用所列短语的适当形式填空

according to; at the mercy of; burst into laughter; come into being; die off/out; in danger (of); in peace; in relief; pay attention to; so that

【小题1】If a group of people or animals __________, they die one by one over a short period of time until there are none left. If a family, race or species __________ there are no longer any one left alive.
【小题2】The teacher regraded the students into small groups __________ ability.
【小题3】He wrote down my address, __________ he might remember it.
【小题4】You should __________ your pronunciation from the very beginning.
【小题5】Hearing the news of his success, he breathed a sigh __________.
【小题6】The retired worker spent the rest of his life __________ in the countryside.
【小题7】Some traditions in China are __________ disappearing.
【小题8】It is still unknown when the universe __________.
【小题9】In the classroom John __________ suddenly, which made the teacher and classmates confused.
【小题10】Not only crops, but also the farmers’ income are __________ rain clouds in that area.