In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
It is best to steer the middle course in life. The key to happiness is to keep (1) ______ bounds and discipline one's life. Eating well is (2) ______ for nourishment but overeating can do more (3) ______ than good. All parents love their children but those who (4) ______ in excessive pampering end up spoiling their kids. (5) ______ riches can bring many evils, enemies, cares and worries.

Select the most appropriate option to fill in blank no. 1.

1. A
   along
2. B
   within
3. C
   among
4. D
   between