. The number 9.11 is a special number, ______, I think, that will be remembered by the Americans for ever.
Dogs have a very good ______ of smell and are often used to search for survivors in an earthquake.
I’ll never forget the day ______ I was born.
It was not until midnight ______ they reached the camp site.
I like getting up very early in the morning because the morning air is so good ______.
You ______ be hungry already — you had lunch only two hours ago!