【C15】A．AsB．AfterC．WhileD．Before

【C15】A．whileB．afterC．beforeD．over

【C15】A．beforeB．afterC．includingD．excluding

【C14】A．beforeB．afterC．whileD．for

Animals think much ____ building their houses.A: asB: duringC: whileD: because

【C15】A．AtB．AfterC．Not untilD．Before

【C8】A．laterB．afterC．agoD．before