Sentence 1: Tom invited Dan to come down to Mexico to visit him. 
 Sentence 3: Tom met Dan at the airport and drove him to the middle of nowhere 
 Sentence 4:  Dan was getting very scared 
 Sentence 5:  Tom laughed and the restaurant suddenly came into view 
 Option 1: Dan couldn't go because he didn't have a passport. 
 Option 2: Dan was somewhat scared but bought a ticket and went down.