____ is a game, toy, or problem that is difficult to solve or complete, e.g., a jigsaw puzzle ____is a question that sounds silly or impossible but has a clever answer, e.g.,What flies without wings?(Answer:Time) ____ is a type of word puzzle where you read clues and complete words in numbered boxes ____ is a set of questions that check your knowledge about something, e.g., What’s the capital of Australia? (Answer: Canberra) Professor Rubik’s most famous ____was his cube. The ____ was to make each side all one color. It took Professor Rubik over a month to ____ his own problem. They gave all forty adults a test of ____ and mental skill. The researchers ____ how video games help older people’s mental age. Overall, the video game ____ scored higher on the test.

unit 4c vocabulary pre intermediate

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