1) this is my third visit to Ho Chi Minh City --> I have ________________ 2) this new supermarket has been opening for a month now. --> this new supermarket was_____________________ 3) we were late because of the heavy traffic. --> if it ___________________ 4) Jack went to Vietnam in 2002. He returned home in 2005 --> Jack_________________ 5) they first made cognac in 1643 --> Cognac has ___________ 6) they have produced Whisky for over 700 years --> whisky was first ______ 7) what is wrong with this computer? --> why __________________