There are certain _______when you have to interrupt people who are in the middle of doing something.
___shortly after it stopped raining.
Mother told Rose to buy some sugar in the supermarket and ___.
Could you write me a letter ___?
I remember that ____ an old church on the top of the hill many years ago.
—— The water changes into thick ice covering rivers and lakes in winter in Harbin. —— ____ in Urumqi and children go skating on it then.