The expression "a huge headache" (l.1) refers to a(n): 
So in "But things went so smoothly that some security experts...." (l.5-6) has the same function as the underlined word in: 
The verb form in "the required checks were being performed" (l.6-7) is in the same form as the verb in: READ TEXT II AND ANSWER QUESTIONS 14 TO 20:
The plural of life (l.1) is:
READ TEXT II AND ANSWER QUESTIONS 14 TO 20:
The plural of life (l.1) is:
READ TEXT II AND ANSWER QUESTIONS 14 TO 20:
The opposite of wet in "in wet cold places" (l.6) is:
READ TEXT I AND ANSWER QUESTIONS 11 TO 13:
The underlined words in "a little hope" (l.15) can be replaced by
READ TEXT I AND ANSWER QUESTIONS 11 TO 14:
The pollution in São Paulo has worsened because of:
READ TEXT I AND ANSWER QUESTIONS 11 TO 14:
In "more are needed" (l.02), the word that has been omitted is:
The aim of the organisation is to:
