89.( )Do you know when he will come back? E. No, thanks. I’m full.
(A) 从方框中选出最佳选项补全对话。(10分)
A: What are you doing, Linda?
B: 90
A: An experiment? What is it about?
B: A theory about air pressure. I fill a jar with water. I cover the top with a piece of cardboard. Then, I turn the jar upside down. 91
A: I think we can’t do it inside. I’m sure that the floor will get wet.
B: No, 92
A: Why? The water won’t stay in the jar.
B: 93 .
A: Great! 94 .
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