First aid is a temporary form of helptosomeone who suddenly falls ill or gets——beforea doctor can be found.

I usually go to school byon weekdays.

There is no doubt _____ man will continue to explore the vast universe in the future, but the rate at which we approach depends on the development of technology.[ ]

What made him ____? [ ]

day, I came across my former classmate, but hisname ______ me, which made me embarrassed.