1. we did （not） know much about global warming （until） we watched the Earthe Day programme on TV.
2. we can save the earth （only） by learning to live in harmony with nature.
3. I will （never） forget the day when I made a very important speech on the Earth Day Summit.
4. Although he is clever ,he doesn`t study well ,
5. If it should rain.the crops would he saved.
1.not untilwe watched the Earthe Day programme on TV did we know much about global warming
2.only by learning to live in harmony with nature can we save the earth
3.never will I forget the day when I made a very important speech on the Earth Day Summit
4. Although clever he is ,he doesn`t study well
补充:As a quiet student he may be,he talks a lot about his favourite singers after class
第五句你给错了吧？如果中文意思是“如果下雨庄稼才能获救”的话，应该是only if it should rain would the crops be saved
1.Not until we watched ... Did we know much.............
2.Only by learning.... can we save the earth
3.Never will I ................