Vocabulary

• pop up: To appear suddenly.
• used to: Did regularly before, but don't do now
• in the first place: To begin with; as the first point or consideration.
• sort: To organize things by putting them into groups
• recommend: To advise or suggest that someone do something
• panic: Overwhelming feeling of fear and anxiety
• completely: In every way or as much as possible
• impulse: Sudden desire to do something that is not planned
• increase: To make or become larger in size or amount
• threshold: Degree or level at which something begins
• calm: Without wind or storm; quiet; peaceful
• expert: Skillful person with special knowledge
• tolerate: To be able to adjust to changes of various kinds
• brain: To strike someone forcefully on the head
• surface: To give (road) a top layer
• advance: Forward movement by an army
• suddenly: In an unexpected or very quick manner
• guide: To help or advise someone about something
• couple: To join something to something else
• risk: To do something potentially dangerous or foolish
• oxygen: A gas in the air that we need to breathe
• reduce: To try to decrease, e.g. your weight if overweight
• exhale: To breathe out the air or smoke in your lungs
• depth: Distance below a surface
• pop: To cause something to open or burst suddenly
• dioxide: An oxide containing two oxides per molecule
• tolerance: Ability to adjust to changes, your environment etc.
• lot: What happens to a person in life from chance; fate
• carbon: Chemical element with an atomic number of 6
• rarely: Not often (seen, done, etc.); infrequently
• place: To put someone in a particular type of situation
• bloodstream: Blood flowing through the circulatory system
• comfortable: Having more than enough e.g. money for your needs
• learn: To get knowledge or skills by study or experience
• allow: To admit the validity or truth of something
• breathe: To move air into and out of your lungs
• build: Your physical shape; physique
• bring: To take or go with someone to a place
• breath: Air you take in and out of your body
• alive: Living; not dead
• gulp: To swallow or drink quickly
• pull: Act of breathing in smoke, as from a pipe
• find: To become aware of something that is happening
• blackout: When the electric power is off; outage
• land: Region or country
• reflex: Body's physical reaction done unconsciously
• goodness: (Used to express slight surprise)
• overlook: To look down on; be able to see from
• diving: To swim deep under water with an air supply
• forceful: Using strong or effective means or expression
• reflexive: Of words that show the action is done to yourself
• underwater: (Moving or existing) beneath the surface of water