To succeed in a scientific research project ________.
A、oneneedstobepersistentA
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Hardlyhadhefinishedhisspeech________theaudiencestartedcheering.
I know it isn ’t important but I can ’t help ________ about it.
________ (fail) several times, they need some encouragement.
Onlywhenyouhaveobtainedsufficientdata________cometoasoundconclusion.
he teacher told them since light ________ (travel) faster than sound,lightning ________ (appear) to go before thunder.
