Completar frases Present PerfectVersión en línea Complete the text with the present perfect form of the following verbs. (positive or negative) por Sandra Edith De La Luz Sánchez 1 have has have has stayed been has introduced risen hasn fallen seen hasn The Channel Tunnel is an impressive example of modern technology , but it ? t so successful as a financial venture . Shareholders are unhappy about the latest reports , which show that the number of cars using the tunnel by 8 per cent in the last twelve months . The number of trucks and commercial vehicles at the same level , but the company ? t an increase in its market share . Airline traffic between London and Paris because of low cost airfares . Eurotunnel ? s directors decided not to review their pricing strategy . Instead , they a programme of cost - cutting in the hope of saving the company .