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100

a group of events that happen in a particular order, one following the other, and are often repeated

cycle

100

the fact of a person, organization, etc. continuing to live or exist

survival

100

something strange or not known that has not yet been explained or understood

mystery

100

treating someone in a way that is right or reasonable

fair

100

to be ready and prepared for something

stand by

200

to gradually become less, worse, or lower

decline

200

relating to money or how money is managed

financial

200

the process of finding information, a place, or an object, especially for the first time, or the thing that is found

discovery

200

happening or behaving in a way that you expect and not unusual or interesting

predictable

200

to understand or solve something

figure out

300

a likelihood to happen or to have a particular characteristic or effect

tendency

300

to find or discover the exact position of something

locate

300

something that has never been made before, or the process of creating something that has never been made before

invention

300

a level of material, such as a type of rock or gas, that is different from the material above or below it, or a thin sheet of a substance

layer

300
to learn about or be aware of the latest information

keep up with

400

an increase in the size or the importance of something

growth

400

to examine a crime, problem, statement, etc. carefully, especially to discover the truth

investigate

400

carried out by machines or computers without needing human control

automated

400

a person you spend a lot of time with often because you are friends or because you are travelling together

companion

400

very great and rare natural ability or skill, especially in a particular area such as science or art, or a person who has this

genius

500

a decision or opinion about someone or something that you form after thinking carefully

judgment

500

the opinion that people in general have about someone or something, or how much respect or admiration someone or something receives, based on past behaviour or character

reputation

500

to begin to have control of something

take over

500

to have to; to have a duty or a responsibility to

be supposed to

500

to support one person or opinion over another

take sides

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