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。

小题1:Now the students have no lessons on S__________ and Sunday.

小题2:It’s cold in Australia in July. People there wear w_______ clothes.

小题3:Hangzhou has lots of wonderful s__________. West Lake is just one of them.

小题4:Ann kept s_________ all day because his little brother broke her toy bear.

小题5:Bob is six feet in __________(身高)

小题6:It’s good manners to keep your _________(声音) down in public.

小题7:My parents usually __________(花费) lots of money on books.

小题8:—— What’s your biggest _________(问题)?

—— I don’t have enough time to sleep.

在我国，下列成本项目中属于固定成本的是（）

A.按平均年限法计提的折旧费

B.保险费

C.广告费

D.生产工人工资