Choose the correct option for each sentence.

1. I'm studying very hard at the moment to / for / so as not to pass my exams next month.
2. I went to bed early in order not to / so that / so as not to I wouldn't be tired in the morning.
3. I have to get up early. I set the alarm for five o'clock in order not to / so as to / in order to oversleep.
4. I'll be ready so / as soon as / in order to you are.
5. We'll stay here to / for / till she returns.