53. the first person to walk the whole ______ of the Great Wall was Liu Yutian.

　 A. long　 B. length　 C. longth　 D. lengths

52. the bell rang and in came our teacher, ________.

　 A. smile　 B. smiled C. smiling　 D. smiles

51.-I won the 100-metre race! -__________!

　 A. Congratulations Yes, you B. don’t be so proud C. it was nothing D. thank you

50. he kept _______ guitar for many years before he became famous.

　 A. practise play　 B. practising playing　 C. practicing playing the D. to practice playing

49. Brian kept _____ off the pizzas!

　 A. falling 　B. to fall　 C. fell　 D. feeling

48. the American ________ very well and he won the gold medal.

　 A. dived　 B. diver　 C. divers　 D. diving

47. he took part in the competition but came in _______.

　 A. twenty　 B. twentieth　 C. twentieth D.twentyth

46. She told me _______ too much.

　 A. don’t eat　 B. not to eat　 C. never eat　 D. not eat

45. They told me the earth _____round the sun.

　 A. moved　 B. moves　 C. was moving　 D. has moved

44. As winter is coming near, the weather is getting ________.

　 A. more and more cold　 B. colder and colder　 C. cold and cold