XI.
1. Bad weather made it impossible for the plane to touch down.
2.My brother is very fond of science fiction books.
3. Peter said that he had already seen the New-tech exhibition
4. They announced that the plane would be leaving in thirty-five minutes.
5. All household chores will easily be handled by a robot.
6.Thomas Edisonset up his first laboratory facility in 1876.
7.Mark suggested that we should go to the Science and Technology Fair.
8.It's not worth persuading him to go with us.
9.Why has noone come up with a way to make aircraft quieter?
10.By the time we arrived at the cinema, the film had finished.
1. soundless
2. harmful_ harmless
3.hopeful_hopeless
4.thoughtful_thoughtless
5.helpful_helpless
6. colourful_ colourless
7.waterless
8.forgetful
9.careful_careless
11.wonderful
12.weightless
13. speechless
14.powerless_powerful
15.breathless
16.peaceful
17.homeless
18. beautiful
19.successful_successless
