Unit 1
1.B living  2.A to minimize  3.D date back to  4.D of being  5.A ashamed 
6.A could one 7.C turn out   8.B exciting   9.C Like   10.C terribly

Unit 2
1. D actors’   2. A What   3. C will have flown  4. B (to) make  5. D /
6. A (should) investigate   7. B should be used    8. D influential  9. B whose 
10. C bad

Unit 3
1. C is   2. C little   3. C differently  4. B falling asleep  5. A have I
6. C would have   7. B more  8. D less  9. B all of whom  10. D are done

Unit 4
1.C ourselves 2.C harder  3.B important  4.B be used  5.C which
6.D are      7.B listed     8.B would have disturbed      9.C just as 
10.C how

Unit 5
1.C would have arrived  2.B have come  3.B are enemies  4.C (in) borrowing
5.C hadn’t gone to      6.C has left      7.C who          8.D or to thank
9.A Peter and me          10.C makes it possible

Unit 6
1.C to be seen  2.B as  3.C that of other species  4.D public  5.A Of
6.B updating      7.D or  8.B was he              9.D coarser  
10.C has redefined

Unit 7
1.D that of any other state        2.D should be called       3.C studying   4.B which  5.B were        6.D or      7.A annoyed     8.B really      9.C suspicious of       10.D being challenged

Unit 8
1.D home  2.D all of which  3.B We have    4.C too weak
5.C to pay  6.C such    7.D has been given  8.C that
9.D on which, or from where   10.B to have been accused

Unit 9
1.B hardly   2.A would   3.B greatness   4.C to analyze
5.C what          6.B might have  7.B of        8.D even though
9.C do    10.D present