Это все потому,что маленькая часть воды на Земле пригодна для питья
1.is,2.it,3.strong,4.healthy,5.are,6.it
без проблем вот держи перевод
1.It is quite clear to everybody in his family that he will have to start getting ready for his exam instead of wasting time
It is quite clear to everybody in his family that he had to<span> start getting ready for his exam instead of wasting time</span>
2.It is impossible to do anything in such a short time. I will have to ask the chief to pit up my report.
It is impossible to do anything in such a short time. I had to ask the chief to pit up my report.
3.You will have to listen to the tape recording of this text several times
You had to<span> listen to the tape recording of this text several times</span>
4. He couldn't join the party because he was busy
<span>He won ' t be able to join the party because he will busy</span>
Was cooking, were talking, was preparing, were laughing, noticed, was moving.