Night________(fall),wehurriedhome.

Onlywhenyouhaveobtainedsufficientdata________cometoasoundconclusion.

________(fail)severaltimes,theyneedsomeencouragement.

Thisdiploma(毕业文凭)________thatyouhavecompletedhighschool.

Abeamoflightwillnotbendroundcornersunless________(make)todosowiththehelpofareflectingdevice