Do you know anything about Chinese knots (中国结)— Yes. They are usually regarded ______ symbols of good luck.

What a lovely day! I hope it ＿＿＿＿＿ fine.

There was a time __________ the people in my village lived a peaceful life, enjoying the beauty of nature.

____ do you go to the library— Every week.

Nuclear energy may be dangerous if