There are many people in the world now. There will be a lot more people next century. So the earth will be very (1)________ and there will be a little room for each person. (2) Maybe there will be only standing room on the earth in 600 years. (3) It will be a very serious problem. So man is thinking of a way to solve the problem.
The moon is the satellite (卫星) of the earth. Man will probably go to live there some day. But there is no air, no plants, and no life on the moon. So scientists are doing all kinds of experiments. They have to(4)________(solve) many problems till man can live on the moon. (5)Our dream will come true one day, we all think.
请在(1)处填入一个形容词使句意完整
将(2)处划线部分翻译成中文
 
将(3)处划线句子改为现在完成时态
 
用(4)处所给词的适当形式填空
将(5)处划线部分改为宾语从句
We all _________ _________ our dream _________ come true one day.