公有制为主体、多种所有制经济共同发展的基本经济制度，是中国特色社会主义制度的重要支柱，也是社会主义市场经济体制的根基。坚持和完善这一制度（    ）

①有利于调动社会各阶层的的积极性       ②有利于调动创造社会财富的源泉的活力 

③能够使全体人民各尽其能、各得其所   ④有利于充分发挥我国分配制度的优越性

—It's________ December 21st.

More than two thirds of the land of the expo garden ________ with trees and grass in the past few years.

    Look at this photo. It's a photo of my two good friends and me. The boy is Tom. 1 is from America. The girl 2 red is Helen. She is from England. And I'm from Australia, my name is Lucy. We3 in the same (相同的) school.

    Tom likes sports very much. He often 4Ping-pong, baseball and basketball after class. He has a great sports collection: some ping-pong balls, two ping-pong bats, eight baseballs and two 5. He thinks it's relaxing and 6 to play sports every day.

    But Helen thinks it's boring. She 7 sports every day. She likes 8. She has many books. She reads every day. I don't have a great collection. 9 I play sports every day. I also (也) 10 sports shows(  节目 ) on TV. I think sports are good for me.