How long ________ they ________ (dig) the ditch?
have … been digging
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________ (catch) in the rain, he was wet to the skin.
You________gonow.It’sgettinglate.
He refused to tell us whether he ________ (undertake) the job.
Hardly had he finished his speech ________ the audience started cheering.
Some molecules are large enough ________ (see) under the electronic microscope.