11. The contracts signed by the company (have) had…………been voided because some stipulations were not met.
12. Ten miles (be) …is……. a very long distance for us to walk.
13. Each package that is not properly wrapped (have) …has……. . to be returned to the sender.
14. The keys of the house (have) …have……. been lost.
15. The plan as well as the proposals (be) …are……. . to be presented in the coming Monday meeting.
16. The box of ribbons for the electric typewriter (have) has………. . been misplaced.
17. It is disconcerting to believe that every possible candidate (have) …had…. . been rejected for one reason or another.
18. There (have) …have……. been more excitement in this city about a sporting event.
19. To me, Mathematics (be) …is……something very easy to master.
20. If nobody (have) …had……. . bought that car from the dealer, then you should return and make another offer.[/QUOTE]