41.  Passengers at 8: 00 and 18: 00 which reach 400 are more than at 14: 00 by 100, and the possible reason for that may be some people don't come back home at noon(they just stay at work and need not take the subway.

42.  What's more , some students hate back English words .

43.  Dear xxx: \

44.  Let's back to when we started to learn in childhood.

45.  However, much of them unwilling spend more time in backing word.

46.  When you spend half an hour in backing word, you will foreget it in the less than half an hour.

47.  In the third place, students should take more efforts to back words.

48.  Disappointed, I backed to the bookstore to return my purchase.

49.  I think, you should be open to your friends, share your happiness and sorrows with them, stand by their side and back them up any time they have trouble .

50.  Professors spend $1.5 million during several years to complete the project that put more than 1, 000 pieces of a giant map back together.