tarmac:black material used to coat roads 铺有柏油的路面

catches on:becomes popular and fashionable 成为时尚，流行

unfold:spread till they reach their full size 打开，伸展开

conducted:performed 进行

investors:people who give money to a project expecting a profit 投资者

Use one of the words or phrases below to complete each of these sentences from BBC news reports.
Note that you may have to change the form of a word to complete the sentence correctly.
tarmac / catches on / unfold / conducted / investors

1.
"When a local gentleman pulled out a tatty bit of paper from the pocket of his wax jacket, I was rather surprised he thought it was something special. When I ________ the paper, I realised that the signatures were written in black ink on the back of the gentleman's birth certificate."
2.
As Spain and Italy's finances have looked more precarious, _______ have been worried about whether the eurozone's firewall could cope with more bailouts.
3.
There is very little to like about motorway journeys. Endless black ________, blurry white lines and fuzzy green trees.
4.
Outside America the trend was beginning to _______ too. Many of the GIs stationed in Europe and Japan during the war were working-class boys from the Western states. While off duty they wore their jeans proudly as a symbol of home.
5.
The tests were ________ at the request of the European Union to see whether travel disruption could be alleviated.