单词拼写与运用（共 8 小题，计 8 分）
根据句意完成已给出首字母或汉语提示的单词，使补全后的句子意思通顺，语法正确。
S____ is the first day of a week.
It is p___ __ to keep your voice down in public.
Gina is a___ in class. She often answers questions.
—What’s your favorite s__ besides maths, Sonia?
—History.
Have you ever heard of the saying “ __（沉默）is gold”?
My friend Wang Ying comes from a ____ _ （南方）town.
It’s very ____（有帮助）to discuss your problems with your parents.
Our government has paid more attention to the problem about food ____（安全）.