Thistest________anumberofmultiplechoicequestions.
A、composesofThefloordoesnotlooksobadwhen________(sweep)clean.
heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
Herefusedtotelluswhetherhe________(undertake)thejob.
________(fail)severaltimes,theyneedsomeencouragement.
Wooddoesnotconductelectricity;________.
