49. There __________ great changes in our country since 1979. (be)

48. Li Ping is in his ________ year at No. 4 Middle School.

47. Some _________ will come to visit our school. (foreign)

46. The sun always shines _________ at this time of year. (bright)

45. Listen! I hear someone _________ next door. (sing)

44. Of all the students in our class, Lucy talks _______ and does most. (little)

43. Everyone should make a contribution to ______ the environment. (protect)

42. Yesterday my friend felt __________ ill. (terrible)

41. Look! That young man is practicing ________English with my uncle.

40. Would you mind my __________ the window? (open)