How long ________ they ________ (dig) the ditch?
have … been digging
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Onlywhenyouhaveobtainedsufficientdata________cometoasoundconclusion.
Thosewho’dliketovisittheexhibition________(sign)yournameshere.
________(catch)intherain,hewaswettotheskin.
He________methathedecidedtoleaveonMonday.
You________gonow.It’sgettinglate.