66. The empty boat was f_______ on the sea after the heavy storm.

79. Before the 18th century, botany was merely a b________ of medicine.

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78. In the 18th century, the Africans made several v___________ to the court of Song Dynasty.

77. Australia is a young nation on an a_________ continent.

76. The boy wrote a good poem, which made his parents d___________.

75．Take the medicine and it has an immediate e　　　　 　on the pain.

74．You should keep the matter r　　　　 　to just mow a secret for the moment.

73．Mr. Smith used to smoke h　　　　 , but he has given it up.

72．He wasn’t feeling well, for f　　　 　cough made him unable to fall asleep.

71．I know the boy who d　　　　 　newspapers every morning.