Day after day, they dragged their feet on and arrived at their destination ________.
People in the west make_______ a rule to buy Christmas presents for their relatives and friends.
I remember everything ______it had happened yesterday.
It is required that students______ mobile phones at school, so seldom_______ them using one.
------Tom is never late for work. Why is he absent today? ------ Something _______ to him.
Roads in this mountain area used to be_______; people found it hard to travel here.