Mary and Bob never talk aloud in class, ______? 

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　　A. do they   B. don't they   C. did they   D. do Mary and Bob

Let's go home, ______?

[    ]

　　A. do you   B. will you   C. shall we   D. do we

　　--________ you ________ to go with me? 

   -- I'd love to.

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Try your best to do it, ______?

[    ]

　　A. do you   B. don't you   C. shall you   D. will you

-- Mum, May I go out and play basketball?

-- ________ you ________ your homework yet?

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