1. having no choice but to ..., all one can do is ..., there's nothing to do except ...
2. having nothing but ..., there is only ..., having only ..., having no more than ...
1. inside, interior
2. among, within
3. middle, center, centre
4. during, while, middle, midst, amid
5. interval, gap
6. mean, average
7. second (of three, e.g. sons, volumes), middle
8. medium grade, medium quality
9. red-light district