This is______difficult problem that few students can work it out.

volunteers are working for 2014 International Horticulture Exposition in Qingdao.

I think it important to learn English. 划线部分在句子中的成份是：[ ]

A：You Tom. What her name.B：I don’t know.

The book ____by the young writer sells well. It is popular among middle school students.