The pair of shoes worn out.
When the expression first came into being, people refused to use it but __________ they began to accept it.
Willie's wife never gives him pocket money until he __________ clearly how he will spend it.
Can you explain __________ the sun goes down in the west?
What an unforgettable experience ! I'll write it down __________ it is still fresh in my memory.
__________,many people go in for them and benefit from them.