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[00:00.00]Unit 2 The apples are falling down the stairs.
[00:06.15]一、 Listen and tick. 听一听，勾一勾。
[00:16.90]1. M: He is sitting down.
[00:21.38]1. M: He is sitting down.
[00:25.51]2. W: He is swimming.
[00:28.92]2. W: He is swimming.
[00:32.24]3. M: They are trying to get on the bus.
[00:37.96]3. M: They are trying to get on the bus.
[00:42.36]4. W: She is cleaning the house.
[00:47.72]4. W: She is cleaning the house.