To succeed in a scientific research project ________.
A、oneneedstobepersistentA
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heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
Thistest________anumberofmultiplechoicequestions.
Herefusedtotelluswhetherhe________(undertake)thejob.
Heaskedmewhethermybrother________(fly)toBeijing.
Thosewho’dliketovisittheexhibition________(sign)yournameshere.
