Complete the sentences,using the past perfect tence. when i arrived at the airport.i saw that (plane/take off) when peter's mum asked him about his homework he said that (he/do) when they got to ann's place (all the guests/leave) by the time i got home from school (my grandma/cook dinner) when the teacher came into the classroom (pupils /learn the results of the test)

When I arrived at the airport.I saw that  plane had taken off (plane/take off)
When Peter's mum asked him about his homework he said that he had done it  (he/do)
When they got to Ann's place all the guests had left  (all the guests/leave)
By the time I got home from school my grandma had cooked dinner  (my grandma/cook dinner)
When the teacher came into the classroom  pupils had learnt the results of the test (pupils /learn the results of the test)