I really miss my American friend Nick. It's nearly four years _____we last meet.

Although the price of the gas ______, many people still plan to buy private cars.

She always looks sad, _____ makes people feel sorry for her.

---I have passed the popular election of the Olympics Maths Competition.

---______.You are always excellent in maths.

The old couple don't want to _______ their son and still live in the countryside although their son urged them to move to the city and live with his family several times.

He is very angry because the bag _____ on the net a month ago hasn't arrived yet.

When the old man recalled the old hard times, he always said, “ It was the first time that I ____ a full meal. I remembered it forever.”

_____ food is hard to find, few birds remain throughout the year.

.UNESO is an international organization ,which _____ United Nations Educational, Scientific and Cultural Organization.

On Jan. 24 , 2012 ,Shen Zhou VIII returned to ____ earth from____ space successfully.