What were you doing this time yesterday? — I ______ on the grass and drawing a picture.

volunteers are working for 2014 International Horticulture Exposition in Qingdao.

Any man ___ eyes ___ his head can see that he’s exactly like a rope. [ ]

I think China ______ a much stronger and more beautiful country in 2050.

Please give me ________envelope, I want to write a letter to my father.