_these coins are of different shapes, sizes andcolors, they all date back to a long, long time ago

The private place is only accessible to the royal family and those who have the______ granted by the Queen.

_________the fact that his first experiments had failed, ProfSmith persisted in his research

Open the window, please. —Certainly. Which one _______ beside the door

依次填入下列各句横线处的词语，最恰当的一组是（ ）①逐步推广使用清洁的可再生能源，减少使用污染环境的能源，是 环境恶化的正确选择。②国庆长假期间，凡在本公司购买商品满1000元者，本公司将 价值100元的礼品券。③作者科尔曼年轻气盛，观点鲜明，但常常论据不足或论证不周，______显得犀利有余，老练不够。④连学好母语都需要花大力气，下苦功夫，_______学习外语呢