1. Solid fuel would be more.......... (economy) 2.Cinema is a medium of mass...................(enqertain) 3.The advantage of living in the countryside is that the air..............(pollute) 4We find advertising on the radio very......................................(effect) 5.Naturally, I was eager to make a good list........... ...............(impress) 6.His mistake was due to youth and.....................................(experience) 7.The shoes were nice, but they were...(comfort) 8.I'm...........sorry, madam, but we don't have those shoes in your size(terrible) 9.The volcano had been....................... ............for 500 years when it erupted(act) 10. My opinion is that ghost are....... There are no ghosts in this world (exist) 11.They................ at least once every two weeks(correspondence) 12. There was a conference to promote international..............(friend) 13.How.............. of you to break that cup (care) 14.We find it............to study here (excite) 15. What can be done to minimize the damage of the............flood? (destroy) 16. They are meeting to find ways to protect the forests from...............(destroy) 17.The....................of computers is one of the recent.....................in our time (invent/achieve) 18.The...................to the problem will be difficult to find (solve) 19. The news has caused......among scientists (excite) 20. Thanks a lot for your......................help (value)