Use one of the words or phrases below to complete each of these sentences from a BBC news report.
Note that you may have to change the form of a word to complete the sentence correctly.
the authorities / blew up / security concerns / the backbone of / ski slopes
1. And, in another mysterious and high-profile case in 2003, US pizza delivery man Brian Wells was killed when a collar bomb he was wearing __________ after he robbed a bank in Pennsylvania.
2. Saif al-Islam, one of the Libyan leader's sons, sought to rally regime forces earlier on Tuesday by making a defiant appearance and claiming the regime had broken ___________ the rebel advance.
3. His beating-up by security forces shows that he has hit home and that __________ tolerance for dissent is touching zero.
4. Glasgow Caledonian University's Moffat Centre, which monitors visitor attractions, said Scotland's __________ benefited most from heavy snowfalls.
5. Brazil had been scheduled to play African champions Egypt on Tuesday 6 September, but the game was cancelled due to __________ in Cairo.