—Why din’t you come to my birthday party last night? —I was going to, but I was _______ occupied with something important.
------Why do you turn back? ------ Oh, the bridge ahead_______.
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.