There was so much noise in the room thatthe speaker couldn’t make himself

It’s too strange that these people should laugh when their relatives die.—– That is the local custom ______ the seventeenth century.

China’s icebreaker Xuelong ______ by heavy floes since Friday after rescuing passengers on a Russian vessel stranded in Antarctica.

I’m not feeling well. I may have ____ bad cold.

He has never been to Shanghai,_____ —_______. He has been there twice.