Nobody believed his reason for being absent from his class _____ he had to meet his uncle at the airport.
----Bruce, I really appreciate your painting. ---- .
It was about 600 years ago __________ the first clock was made.
He is wearing sunglasses to __________ his eyes from the strong sunlight.
The policemen are searching _____ every house _____ the thief.
. The book, _______ is blue, is mine.