It’s common ______ that the Japanese eat Sushi.

--- What kind of dumplings would you like?---I don’t like meat, so I’d like some ______ dumplings.

 There are some _______in Dayton Art Museum ,For example, no food or drinks is allowed inside.

—Will you fix up the machine according to the ______, David ? –No problem.

As a student, you need at least           sleep a day.