This book teaches us how to analyze _______is causing the stress in our lift.
Only when the government increases affordable homes for low-income groups______.
Not until________,_________.
It was in the factory _________ his friend worked _______ he picked up a lot of experience.
It is the film _______ director is Steven Spielberg _______ attracts quite a few viewers throughout the world.
——Where did you come across our chemistry teacher ? ------ It was in the supermarket ______ I purchased mooncakes. that B. which C. where D. when