These trees____ ____ ____ ____ ____(在.中起重要作用）keeping the earth.每空一词____ ____ ____ ____(对......来说，......是不可能的）such a small child to work out this problem.

These trees____ ____ ____ ____ ____(在.中起重要作用）keeping the earth.每空一词____ ____ ____ ____(对......来说，......是不可能的）such a small child to work out this problem. Where ____ you ____(be) these days? These knives can be used for cutting.同义句These knives can ____ ____ ____ ____. How many trees____(plant)in your school last year These are my sister's presents.对my sister's 提问.____ ____ ____ these? the city ____ (change) these days. Are these your frenids? yes ____.no____ She is washing these ____ (dish) These ____ (watch) are from his parents. He ____(like) these sports things. Every picture except these two ____(sell). ____ scary these tigers are!在线等 tom,____(taste)these french fries shanghai has ____ (development )quickly these years. these bikes are the ____(twin) Why are you so ____ ____ these days?(forget) These are fat pigs.(同义句转换)These____ ____ ____ All these people are working hard.（改为感叹句）____ ____ all these people are working.