Read the text and fill in the gaps with the verbs in the correct from an american and a frenchman , who knew only their own languages , were having dinner at the same table on board a ship. on the first day the frenchman , who came , got up , made a low bow and said . " bon appetite! " the american thought he himself , so he also bowed and said "watson". this times , and the american , who could not why the frenchman should introduce himself so many times , asked his friend about it. the friend explained that " bon appetite! " "good appetite" and the american having understood the mistake decided to correct it . the next time he was the first at the table , and when the frenchman came , he got up , bowed and said , " bon appetite! " the frenchman immediately 6.. the bow and said , "watson". 1.a. was b.has been 2.a. is introducing b.had introduced 3.a.has happened b.had happened 4.a.to understand b.understood 5.a. meant b.means 6.a. had returned b. has returned c.had been d.is c.introduced d.has introduced c.happened d.would happen c.understands d.understand c.mean d.had meant c.returned d .was returning