Tosucceedinascientificresearchproject________.
A、oneneedstobepersistent________(fail)severaltimes,theyneedsomeencouragement.
Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.
Matteristhename________(give)toeverythingwhichhasweightandoccupiesspace.
Thistest________anumberofmultiplechoicequestions.
Heaskedmewhethermybrother________(fly)toBeijing.
