________is dangerous for us to swim in the river alone.

—Tom, you never told me why you were late for school again,_____ you?        —____. But maybe you forgot it, sir.                           

-He didn’t go to the this morning, did he? -______. Though he was not feeling very well.

---She’s seldom asked to do housework at home,        she?---      . Her parents are very busy with their work, so she has to do the laundry every day.

---Mom, there is little milk,______?---No,there isn’t. Could you please go and buy some?