That light rail transit line(轻轨), __ _in July 2009 and ___ in 2012, will be China’s longest light rail transit line in history.
31.-What are on show in the museum? -Some pictures ____ by middle-school students.
30. Even if you are an experienced teacher, you sometimes ____ make some mistakes.
27.-What an amazing story! It’s the most impressive story I’ve ever read. -But I’m sure it won’t interest ____.
35.-Did you have a good sleep last night? -Yes, never sleep ____.
32. Two middle-aged passengers fell into the sea. ____, neither of them could swim.