Giving small children some money as a gift during the Spring Festival is a common ______ in China, which may seem strange to foreigners?
--Did you listen to Mr. Jackson’s lecture? --Yes, I have never heard a _______one.
Jim apologized for ______ to inform me of the change of the plan.
Great changes ______ in my school in the past ten years.
________ you interrupt now? Can’t you see I’m on the phone? _ Sorry, Sir, but it’s urgent.
Is this school ______ you used to study?