A river that rises in the Rocky Mountains of northern Colorado and flows southwest for 1,468 miles (2,333 km) to the Gulf of California. It passes through the Grand Canyon..

Piece of paper showing you have paid. mark bill as paid.

Means of expressing, showing, or achieving.

cause, explanation, or justification for action or event. Explanations for why some things occurred or was done. think, understand, and form judgements logically.

To do, be or happen for the first time; begin.

To come back after being away from somewhere. To occur again.

Word such as 'a', 'an', or 'the' used before nouns. bind to undergo training period.

difficulty or problems. To do difficult or bad things which cause problems.

A place where passenger planes land and take off.

on Wednesday. day of week before Thursday and following Tuesday.

using thought or rational judgement. Thoughts behind an idea, opinion or belief. To have an idea, opinion or belief about something.

Being what was wanted or needed. used to greet someone in polite or friendly way. instance or manner of greeting someone. To greet someone who has just arrived.

take someone or something to place.

state of being anxious and troubled. Some things that causes trouble or concern. feel or cause to feel anxious or troubled about actual or potential problems.

Not present; not available. To fail to hit something e.g. a ball.