FCE reading part 3

Knowing what the weather is going to be like helps us plan our _________ (day) activities effectively.

In the past, people recorded changes in the weather to identify patterns which would _____ (able) them to forecast

... them to forecast with some ____(accurate).

They realised, for example, that high, delicate clouds generally announced the ______ (arrive) of good weather.

Modern forecasting is more sophisticated, and uses a ____ (combine) of computer models, monitoring and knowledge trends.

Today's forecasts are based on several differents ______ (measure).

Nature will always be _____ (predict) though, so we can never really be sure what will happen.

It's difficult to forecast further in advance than five days with much _____ (certain) as small changes can have a big impact on the weather.