He visited the bookstore every week. He became such a____ customer that the bookseller gave him some books as presents.

When the man came in, gun in hand, we all stood there, ________．

Australia is a(n) ________ country.

When he was opening the door, he was ___________ that he was being followed by a policeman.

—Why are so many northern Chinese visiting Southeast Asia countries recently ?—They are trying to get a ___shelter from the cold weather in winter.