Answer:
1. If the bus will be crowded, she'll have to walk to the office.
2. If he gets up early he will get good health.
3. If she is weak, she will not go out very often.
4. If the sun was in the right direction, the photographs would come out very well.
5. If he watches film by night, he falls asleep by day.
6. If he would be too lazy, as he failed in the examination.
7. If he drives carelessly, he will have a serious accident.
8. If my car breaks down, I will miss the meeting.
9. If he doesn't study hard, he will fail the final exam.
10. If Susan eats too much, she will be overweight.