Here are the correct forms for the verbs in brackets:

44. What were you **doing** at this time yesterday?
45. I hope it **does not rain** when we **start** early tomorrow.
46. My sister **has played** the piano since she **was** a child.
47. I **will never forget** what you **just told** me.
48. He **left** home two weeks ago and we **have not heard** from him since.
49. She **won** the gold medal in 2004.
50. While you **were playing** the guitar, I **wrote** a letter.
51. I wish they **were being** here now.
52. We used to **walk** to school.
53. Wearing uniforms **makes** students feel equal in many ways.
54. This school **was built** 15 years ago.
55. When I arrived home last night, my mother **was watching** TV.
56. I was used to **eating** at noon when I started school.
57. He used to **eat** dinner at five o'clock.
58. When I was young, I used to **swim** every day.
59. He used to **like** her, but he doesn't anymore.
60. Don't worry, some day you will get used to **speaking** English.
61. Lan can't get used to **studying**.
62. He used to **dance** every night, but now he studies.
63. Adam is used to **sleeping** late on the weekends.
64. Chieks is used to **eating** American food now.
65. She finally got used to **eating** our food.
66. He **has not seen** his brother recently.
67. I can't go to the movies with you if it **rains** heavily.
68. Lan **was taken** to school every day when he was a child.
69. Would you mind **showing** me how to send an e-mail?
70. The "Ao dai" **has been mentioned** in poems and songs for centuries.
71. What are your children **doing**?