电子课本网 第72页

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      However, some people don't behave themselves in tourist
attractions when travelling. For example, some of the travellers
throw rubbish everywhere. It's not only impolite but also 
harmful to the environment around us. We should put rubbish
into dustbins. Some of the travellers like picking flowers in a 
park. It should also be stopped because flowers are beautiful
and we should protect them. We can put up signs beside the 
flowers to remind travellers not to pick them.
      Let's take action right now and travel in good manners.
Half a year before graduating from college.
More than 20.
He felt surprised.
The author's son's reply was "Thank you." while 
the others said "Goodbye.".
It is unusual.