he teacher told them since light ________ (travel) faster than sound,lightning ________ (appear) to go before thunder.
travels, appears
暂无解析
Wewerebusy________(get)thingsreadyforthetrialproductionwhenhephonedus.
Abeamoflightwillnotbendroundcornersunless________(make)todosowiththehelpofareflectingdevice
ComradeLi________beinBeijingbecauseIsawhimintownonlyafewminutesago.
Tosucceedinascientificresearchproject________.
Ishallneverforget________(meet)thelatePremierZhouduringhisinspectionofourfactory.
