_______ my sister three times today but her line was always busy.
“You can’t have this football back_____you promise not to kick it at my cat again.” the old man said firmly.
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.