To succeed in a scientific research project ________.
A、oneneedstobepersistentA
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Night ________ (fall), we hurried home.
The director recommended that she ________ (study) more English before going abroad.
Ifound________toanswerallthequestionswithinthetimegiven.
________ (catch) in the rain, he was wet to the skin.
How long ________ they ________ (dig) the ditch?
