To succeed in a scientific research project ________.
A、oneneedstobepersistentA
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Ihavebeenstudyinghereforfouryears,bynextsummerI________.
Iwishyou________likethat.
Agreatnumberofsmallpowerstations________(setup)intheircounty sinceliberation.
Wewerebusy________(get)thingsreadyforthetrialproductionwhenhephonedus.
Hefellasleepimmediatelylastnight;hemust________(be)verytired.
