The father as well as his three children ___skating on the frozen river every Sunday afternoon in winter.

The girl sat in the corner quietlynone of us noticed she wasthere.

This book______Tom’s,because his name is on the book.

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

下列各句中，没有语病的一句是