The world population is rising so quickly that the world has become too crowded.请问crowded是过去完成时吗?为什么不用一般现在时The world has become too crowded.是现在完成时吗？为什么不用一般现在时？

The world population is growing .(rapid) The Population of the world become largerThe Population of the world become larger and larger. The ___(world,world's)population is about 1700 million. 同义句what is the population of the world 同义句what is the population of the world ---------- ----------- ------------ the population of the world The b___ problem of the world is the interesting population 英语翻译（）is the population of the world today? India has the secong large population in the world.找错 5. The population of the world i_____ very fast填空 India has the second largest population in the world. The population of the world ____(grow)faster空里填什么 the population of the world still nowA has grown B is growingthe population of the world （ ） still （ ） now The _____ population is increasing.world's worldworldsworlds' 10000 years ago ,the world's population was very s population is one of c___ in the world 6The world’s population is one of the biggest_________(challenge) of the world today. At the b___of the 2010s.the population of the world will pass six billion China has a larger population than any other country in the world为什麽population前面要用a 填空The g of the population is a big problem in the world.