阅读下面的诗歌，完成下列各题。

春望

【唐】杜甫

国破山河在，城春草木深。

感时花溅泪，恨别鸟惊心。

烽火连三月，家书抵万金。

白头搔更短，浑欲不胜簪。

材料一：一年、两年、三年……过去了。他由南方走到北方，从太阳升起的地方跑到太阳落山的地方，不顾风吹雨打，不怕艰险劳累，一直率领人们从事治水的艰苦劳动。经过13年，终于把洪渊填平了，河道疏通了，洪水由高处流入低处……一块块平原露出水面，人们又重新搬回了陆地，修房盖屋，垦荒种地，养牛牧羊，过上了幸福的生活。

──杨思华、陈鲁编著《画说中国历史》

材料二：周初，周公封儿子伯禽于鲁，要他“大启尔宇，为周室辅。”

请回答：

请先阅读下面短文，掌握其大意，然后用方框中所给的词的适当形式填空，并写在答题卡的相应位置。每个词限用一次。

     Many people have cars in the city. But pollution is a problem because of the____. Nowadays some downtown (市中心) areas around the world don't have cars. These car-free zones (无车区) are____ for people, bicycles, and public transportation only.

     Eight million people____ in the center of London and another two million people go to work there every day. The downtown area is very____ with hundreds of cars, buses, and taxis, but there are ____a lot of beautiful parks with free music concert. At lunchtime, many people go there for a rest ____ they get off work.

     Parts of Tokyo are always crowded with hundreds of people - but no cars! These modern car-free zones are____ popular and people like shopping there.

     In the past, Bogota was polluted because there____lots of cars and traffic. Now the downtown area is car-free zone and the air is____! Many people don't have a car and half a million people take the bus____. There are lots of stores. It's not expensive.