Thisdiploma(毕业文凭)________thatyouhavecompletedhighschool.
I found ________ to answer all the questions within the time given.
Onlywhenyouhaveobtainedsufficientdata________cometoasoundconclusion.
heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.