ANSWER：
1. b,c,a
2. visitors are coming up with creative ways to collect the stamps without using the 30-yuan passports
3. 伴随观光客者而来的还有垃圾
4. About 800,000 vistors (160000x5)
5.
(1) Technique, to perfect
(2) traffic pressure,
(3) and also more waste
(4) their maps
(5)books
(6)newspapers
(7)even T-shirts.
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