This book is said to be a special one, which______ many events that cannot be found in other history books.

Many teens don't get enough sleep because they have too much homework to do, which ________ them up at night.

Li Yuchun’s song was a________at once and its recording tape rose to No.1 on the best seller list.

 Tom's mother kept telling him that he should work harder，but ________ didn't help.

It is surprising in ________ that people in ________ twenties wore such kind of clothes.