Thosewho’dliketovisittheexhibition________(sign)yournameshere.
Themorewelookedatthepicture,________.
ComradeLi________beinBeijingbecauseIsawhimintownonlyafewminutesago.
Ipreferthisdiagram________thatone.
Abeamoflightwillnotbendroundcornersunless________(make)todosowiththehelpofareflectingdevice
Hotmetal________asitgrowscooler.
