It suddenly occurred to me        I hadn’t locked my door．

I wanted to buy a storybook but there were______ left in that bookstore．

--Would you like this pair, or that pair? ---___ will do.

Does＿＿＿matter whether he can finish the job on time? 

Since many young people have become rich on Taobao.com, I wonder what        ________ is like to run a successful on-line business.