71. I like the house very much. The Christmas lights give it a festive __________(气氛).
72. Farmers ____________（溶解）man-made chemicals to grow their plants.
73. This scientist has come up with a new ____________(理论) in his research field.
74. The new hospital which is under construction will ____________ (有益于) the entire community.
75. Strange thoughts___________ (浮现) into my mind when I was nearly asleep.
76. Don’t talk about such a thing in the p___________ of young children.
77. I have no p ___________ with people who are always complaining of their misfortunes.
78. I don’t think it’s my f___________ that the bottle blew up. I just filled it with water.
79. I stepped on the man’s foot by a______________. Immediately I apologized to him.
80. There are no dinosaurs any more. They have been e_____________ for a long time.