The students found it easy to_______ what the experienced teacher had taught.

ms to some experts that 56．com, youku．com and tudou．com _____ 90% of the videomarket in this area．

16. It is reported that they ____ arms andbegan to fight against the invaders .

I wanted to see the Beijing Opera, so Lingling offered me to watch an opera.

Shanghai government is considering ____ 100%smoke-free public places by 2017.