—Tom has never visited the Great Hall of the People, _____?—He went there last month.
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--It’s so hot here. Do you mind ____________ the window? ---____________. I will do it right now.
My computer broke down, but I am not clear ___________________.
--- What do you think of what I said? --- Sorry. I _____ about something else.
---Why not stop __________ a rest? --- Oh, it’s so exciting that I can’t stop ____________ the model plane.