A great number of small power stations ________ (set up) in their county since liberation.
have been set up
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Iwonderifhecouldgetit________(do)beforetomorrow.
How long ________ they ________ (dig) the ditch?
________(catch)intherain,hewaswettotheskin.
Onlywhenyouhaveobtainedsufficientdata________cometoasoundconclusion.
Only when you have obtained sufficient data ________ come to a sound conclusion.
