与硝酸银生成白色银盐沉淀()
A. 黄体酮
B. 炔雌醇
C. 苯丙酸诺龙
D. 醋酸氟轻松
E. 丙酸睾酮
They spend too much timethe report.
A. writing
B. to write
C. on writing
D. write
--What beautiful shoes you're wearing! They must be expensive--No，they only____ l0 yuan．
A. spent
B. took
C. paid
D. cost
I have to ____ them 20 dollars for this room each month.
A. spend
B. pay
C. cost
D. take
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