Sentence 1: We had only Italian style pizzas in Boston in the sixties. 
 Sentence 3: The pizzas were thicker 
 Sentence 4:  For a few years we ate only Greek style pizza 
 Sentence 5:  Most of the shops are now gone 
 Option 1: We decided to open a competing type of pizza. 
 Option 2: In the seventies several Greek style pizza shops opened.