This diploma ( 毕业文凭 ) ________ that you have completed high school.
B
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Herefusedtotelluswhetherhe________(undertake)thejob.
Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.
Agreatnumberofsmallpowerstations________(setup)intheircounty sinceliberation.
Howlong________they________(dig)theditch?
Ihavebeenstudyinghereforfouryears,bynextsummerI________.