Now researchers say that middle age________be the most fruitful time of life, full of new growth and development.
environmental damage is done, it takes many years for the ecosystem(生态系统)to recover.
____, he talks a lot about his favorite singers after class.
You must keep on working in the evening, you are sure you can finish the task in time.
--Did Jack come back early last night?--Yes.It was not yet eight o'clock_____he arrived home.
I’d like to arrive 20 minutes early I can have time for a cup of tea.