It was at the airport _____ was completed last year _____ he worked as a volunteer helping foreigners in need of translation service. 

I often think of the hours _______ I stayed with you, _____ has had a great effect on my life.

The owner of the cinema needed to make a lot of improvements and employ more people to keep it running, _______meant spending tens of thousands of pounds．

Many people who had seen the film were afraid to go to the forest when they remembered the scenes ______ the villagers were eaten by the tiger.

A turning point of the continuously high housing price won’t appear suddenly because there must be a certain process _____ many factors lead to the change.