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Paris smog

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checking or watching something to find out what happens
even numbers are numbers that can be divided by two (eg: 2, 4, 6); odd numbers are those in between (eg: 1, 3, 5)
hybrid vehicles
cars, lorries, vans or motorbikes with engines that use two or more kinds of power
easy to see
difficulty; something which causes extra time or effort to do something
the stakes are high
there is a lot of risk