27. Tom( )more than twenty pounds on the novel.

6、Every means _______ been tried to solve the difficult problem.

5、Each new way of looking at a situation ________ our understanding and makes it easier to discover new possibilities.

4、Modern machinery _______ been installed in this newly-built factory.

3、Although they are twins, they have nothing in _________.

2、That man looks familiar to me. He reminds _______ Dr. Richards.

1、Nancy works in a shop and _______.

41. It was well known that Thomas Edison()the electric lamp.

40. The workers are busy()models for the exhibition.

39. His mother()alone since his father died.

38. I often see( )the road on his way home.