单项选择题
The book has been published but won't be（）till next month.
A.on showB.on the runC.on saleD.on the go
单项选择题 The curator（）the visitors round the museum.
单项选择题 In the beauty competition，women are asked（）some of the exercises（）the music．
单项选择题 My English knowledge is very（）though I have learned it for six years.
