Those T-shirts are usually $35 each, but today they have a ______ price of $ 19 in the Shopping Centre.

The president was so absorbed in his workthat not a sound ______

With a huge amount of food ________，all of the staff are busy preparing for the dinnertonight.

31. – How did your father catch so many fish?– By using a ________.

While writing a letter, _____. [ ]