1.   That is unacceptable in a crowded metropolis, where summer heat and humidity can reach triple digits.

2.   The museum has survived in part because it sits so far from the crowded metropolis.

3.   Traffic congestion developed at almost every corner of the crowded metropolis.

4.   Many of the illegal structures were put up in recent months after reports that the authorities were planning to transfer the airport from the crowded metropolis to nearby Huaxiang.

5.   Shanghai opened a ring road Wednesday, the first of several infrastructure projects to ease traffic congestion in this crowded eastern Chinese metropolis.