71. Paradon me for being late. It is very kind of you to wait for me.

72. Try to finish it. It is no use exlaining.

73. Fashion makes me spend too much money on clothes.

74. My sister is busy with writing a letter.

75. Please let him go with me.

76. Don’t hurry ! There’s no need running.

77. I chose to go to Stanford University for my undergraduate studies.

78. You must keep practicing on the computer until you understand how to use all of the.

79. I dislike driving long distances programs.

80. Jack got into trouble when he refused opening his briefcase for the customs officer.

Hướng dẫn truyền xung thần kinh ở 2 nơron ngược nhau.

Rice isn't grown in cold climates. => Câu bị động thì HTĐ.