In      (拥挤的) places like airports and railway stations, you must take care of your things.

交通拥挤是因为现在街上的汽车比以前多得多。

________ ________ ________ ________ now because there are ________ ________ cars than before in the streets.

86. 因为交通拥挤,今早我又迟到了。

I was late again this morning ________ ________ the heavy traffic.

87. 经过一天的努力, 他们终于扑灭了森林大火。

After a day’s hard work，they ________ ________ the forest fire at last.

88. 该动身了，飞机一小时后起飞。

________ time ________ set off，since the plane will take off in an hour.

89. 休息会吧，我太累了，不能再走了。

Let's have a rest，I'm ________ tired ________ walk any farther.

90. 如果父母读读自己孩子的微博，就能更好地了解他们的想法。

________ parents can read their children’s microblogs,they ________ know their thoughts better .

—The supermarket is crowded（拥挤的）. There are ___________ people there.
—Yeah, and the things there are always ______________ expensive（贵的）.