I kept ______ the incident, asking myself again and again how it could have happened.

His contribution to the boy’s welfare was to________him for the world in which he would live

The Whites are leading a very happy life; the farm is big enough for them to ____.

Li Ming likes playing ____basketball, but his sister likes playing___piano.

The Tang Dynasty，when Li Bai lived，was the golden age of ______ Chinese poems.