1.New devices have been invented to help people live a longer life by scientists.
2.If I had enough time ,I could go on holiday this summer​
4.If I knew the answer, I could tell you​
6.The villagers in the raged flood were evacuated to the safe place last night by the rescue workers
7. Aids will be provided for the homeless people tomorrow by the students
10.Many houses were destroyed in this village last week by the storm
12.Despite the bad weather the football match was not canceled
17.Plastic bags are a major source of waste so the we should not throw plastic bags everywhere
18.If we had enough money ,we would hold the festival
19. While the tortoise was running,the hare was sleeping
20.Although the girl worked hard , her stepmother wasn't happy