To succeed in a scientific research project ________.
A
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Thefloordoesnotlooksobadwhen________(sweep)clean.
You________gonow.It’sgettinglate.
Iwonderifhecouldgetit________(do)beforetomorrow.
Ihavebeenstudyinghereforfouryears,bynextsummerI________.
Heaskedmewhethermybrother________(fly)toBeijing.