--- I will come to attend your lecture at 10:00 tomorrow. --- I’m sorry, by then my lecture will have ended and I ______ my guests in my office.
.We can never expect _________ bluer sky unless we create _________ less polluted world.
Huangshan is ________ most beautiful tourist site and I want to visit it ________ second time next month.
He was elected________president of the company,and________news came,in fact,as________surprise.
Sometimes she talks with Mary over ________ telephone,that is to say,they keep in touch with each other by ________ telephone.
As is known,it was Hu Jintao,________ president in our nation,who gave ________ lecture at the opening ceremony of the Beijing 2008 Olympic.