Land animals are believed ______ from seaanimals

onsidered___ a computer, which was considered___ a great help in their work.

product ____ unsatisfactory within 7days in any way, you can take it back.

tember of 2016, the G20 summit will be held in Hangzhou, ________ theme is to stress innovation, reform and development.

Is it, in your opinion, possible __________ new measures will be taken to improve the terrible traffic?