A great number of small power stations ________ (set up) in their county since liberation.
have been set up
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Ihavebeenstudyinghereforfouryears,bynextsummerI________.
heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
Ifound________toanswerallthequestionswithinthetimegiven.