We ________ go out to restaurants, but mostly we eat at home.
A
A偶尔地、偶然地、不经常B相对地、比较地C持续地、不间断地D完全地
The engineer ______ my father works is about 50 years old.
Theothertimingsystembelongsinourinternalclocks，which，left________，wouldtiethebodytoa25-hourrhythm.
A linguistic theory is constructed about what ______ is and how it works.
ThedivisionofEnglishintoOldEnglish,MiddleEnglish,andModernEnglishisnonconventionalandnotarbitrary.