His mother becomes disappointed whenever he fails to live up to her________(expect)
expectation
暂无解析
Heblamedhispoorperformance_____jetlag
Expertshavefoundthatnormalsleepcanbedividedintofive______stages
Itwas________ofyounottodisturbuswhileweweresleeping
InAugust1977,asatellitetogatherdataaboutthe10millionblackholeswhicharethoughttobeintheMilkyWay.
Somestudentsfromaskingquestionsinclass.（）
