41.  While people in other countries were trying to catch wild animals, farmers in China were developing the science of agriculture.

42.  So, at first, we just stood there and listened, trying our best to catch what they said.

43.  From the top of the lookout, he caught a sight off nine savages who were eating something.

44.  As time goes by, the society is developing, everyone of us should get to know the world or we couldn't catch up with the world .

45.  I try to do these that I just said, I would catch the situations, pratise myself and connect with people closely .

46.  For one thing, we can catch up the times and know the latest news of every sides of society.

47.  We can't catch up with the society.

48.  They catch back their heart on lesson.

49.  You can't be in bed any longer or you'll be caught by the head of the floor and was forced to paid for $27.

50.  To much spare time will not make people catch up with the speed of normal work on Monday.