Answer:
oxygen could run out at anytime
Knows little. 2 and 3 are both presuming too much, as it's the writer's duty to get them interested and informed. 4 basically doesn't matter, and furthermore may not even apply in many forms of writing. 1 is the best answer, as writing for general audiences is intended to inform and expand the horizons of the reader.
1) has your son grown incredibly tall
2) my daughter is hardly ever ill
3) are his parents retiring next year
4) ??
5)??
6)the police immediately arrived at the bank
7)James is apparently getting divorced
The indians from the mission cut the grains, separated it in sheath and placed it behind gramas house