________ (fail) several times, they need some encouragement.
Having failed
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Ipreferthisdiagram________thatone.
________(fail)severaltimes,theyneedsomeencouragement.
Thisdiploma(毕业文凭)________thatyouhavecompletedhighschool.
Herefusedtotelluswhetherhe________(undertake)thejob.
heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.