六、语法填空。
Many of you have probably had this experience. You get 28. ______ a train and are ready to have a rest or read a book. But you find that at the moment, a passenger in front of you 29. ______ (watch) a TV show on his phone without headphones (耳机). The child next to you won't stop 30. ______ (cry). And 31. ______ old lady behind you talks on her phone loudly during the whole trip.
Can the train be less 32. ______ (noise)? Yes. The Beijing-Shanghai high-speed railway, one of China's 33. ______ (busy) high-speed rail lines, has quiet carriages (车厢) now. In quiet carriages, on-board videos are muted (静音). Doors at the end of the carriages are always closed in order 34. ______ (reduce) noise from other carriages. Train attendants (乘务员) will make sure that passengers follow the 35. ______ (rule).
Passengers can choose quiet carriages when booking 36. ______ (they) tickets on their phones. 37. ______ some people like the new service, there are also hot discussions about how quiet travellers should be in quiet carriages. What's your opinion?

on
; is watching
; crying
; the/an
; noisy
; busiest
; to reduce
; rules
; their
; Although/Though