21. ______ the course very difficult, she decided to move to a lower level.

41. The passage is mainly about the differences between British English and American English in _____. 

（ ）13. The products of company are sold only at home.

59.在加工过程中，会重新人为加入某些食物的维生素和矿物质，但却未必和原来的一样健康。

49. ______ absorb smelly sweat easily and therefore are better at hiding body odor.

（ ）54.Gina is a music teacher. Although she prefers classical music, she likes to follow the kind of music that interests the teenagers she teaches.

44. What can we learn from the passage?

（ ）51.Although Rob lead a quiet life in a small village, that doesn’t stop him from wanting to find out about the latest scientific development.

60.如今人们有了更多的闲暇时间，因而对各种服务的需求增长得如此快。

33. Better take a hat with you ______ you get sun burnt because of the strong sunlight.

7.

46.The ______ of bacteria causes body odor.