Boys are usually dependent on their parents . . . . . . . . they earn enough money to support themselves.

till
provided
so
lest

The correct answer is: A. till

The word “till” means “until”. In this sentence, it is used to indicate that boys are usually dependent on their parents until they earn enough money to support themselves.

The other options are:

  • B. provided : This word means “on the condition that”. It would not make sense to say “Boys are usually dependent on their parents on the condition that they earn enough money to support themselves”.
  • C. so : This word means “in order that”. It would not make sense to say “Boys are usually dependent on their parents in order that they earn enough money to support themselves”.
  • D. lest : This word means “for fear that”. It would not make sense to say “Boys are usually dependent on their parents for fear that they earn enough money to support themselves”.

I hope this helps!