unaccompanied –adj. without another person; alone
guardian –n. someone who takes care of another person or of another person's property
option –n. the ability to choose between two or more things
expensive – adj. costing a lot of money
standard -n. : a level of quality or set of conditions that must be met in order to be accepted
deter-v. to cause (someone) to decide not to do something
impending-adj. happening or likely to happen soon
