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etters. 17 They had a hard time going ___________ the forest . 18 Don’t kid me . please tell me the _____________. 19 Children should speak to old people ____________. 20 Computer is one of the most useful ____________ in the world. 21 When we meet with difficulties , our teacher always _________us to work them out by ourselves. 22 Your radio is too loud . Please turn it ____________ a little. 23 There is a _________ on the wall . It says Jay zhou will have a concert in our city. 24 The sleeping pills don’t ___________ . I still can’t sleep well. 25 You should follow the rules and don’t ____________ them . 26 It was the doctor ___________saved the boy’s life. 27 The ____________of China is up to billion. 28 How time flies ! Ten years ___________ passed. 29 Peter borrowed my camera but he didn’t ___________it to me. 30 He likes singing , ____________pop songs. 31 The _____________of the room is 25176。C. 32 Jack is going to be an __________ , so he is studying math really hard. 33 I send several ___________ by my mo