Then moment _________ Mary will always remember is _________ Mr．Black gave her a lot of valuable advice on how to improve her writing．

I heard that a great fire _________ when I was out in Tianjin last night.

__________! What a beautiful sound (声音)!—Yes, it __________ a bird.

ing to the weather forecast, this airport will not be suitable for landing, and 50 miles away.

_________do you write a letter to your father— I seldom or never do that now. Instead, I call or e-mail him almost every day.