13. If someone doesn't put the coal in, the fire will go out. (UNLESS) 14. The girl is very friendly. She lived next door to us. (WHO) 15. He doesn't have a computer now. (WISHES) 16. It's 3 years since I last saw Nam. (SEEN) 17. It was a two-hour flight from Hanoi to Ho Chi Minh City. (TOOK) 18. We last saw our grandfather five months ago. (HAVEN’T) 19. “Where do your parents live now?” said Nam to me. (ASKED) 20. Spending our weekend in the countryside is very interesting. (IT’S) 21. Have you ever spoken to the people? They live next door. (WHO) 22. Jane can play the piano better than Bella. (WELL)

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