1cycling way to see the country. 2 paris is one of beautiful cities in the world. 3 l've bought apple pie. 4 cardiff of wales. 5 people in the usa speak language. 6 sometimes it's very difficult to tell .

1) a
2) the
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1 cycling is..a.wonderful way to see the country.
2 Paris is one of ..the..most beautiful cities in the world. 
3 l've bought .a...tasty apple pie.
4 Cardiff is..the...capital of Wales.
5 People in the USA speak ...the...English language.
6 Sometimes it's very difficult to tell ...the..truth.