The old man ________ to live with his wife ,but now he is used to __________ by himself after she died .
--- Time for bed, Dear. --- Not yet, Mum. I _____ until I _____ going over my lessons.
--- Alex, did you find the old house that you used to live in?--- Yes, but with much difficulty, for my hometown has _____ changed over these years.
--- _____ free lunches _____ to students in all schools in China? --- No, only in the countryside.
Zheng He is _____ great pioneer in exchanging cultures _____ Chinese people today still rememberhim.
--- It’s reported that vaccines(疫苗) for H7N9 bird flu may hit the market as early as May.--- Really? If so, we _____ depend on those from abroad.