39. There are many .............................. in our country of a year. CELEBRATE
40. We celebrate our .............................. Day on September 2nd. DEPEND
41. You must be .............................. when you open that door. CARE
42. We can save .............................. resources by using solar energy. NATURE
43. We can't clean up our ..............................rivers and seas over night. POLLUTE
44.He is ..........active in spite of his old age. wonder
45..............is a very serious problem in many countries employ
39, celebrations
40, independence
41, careful
42, natural
43, polluted
44, wonderfully
45, unemployment
39. celebrations
40. Independence
41. careful
42. natural
43. polluted
44. wonderfully
45. unemployed