1B Having won

2B shadow

3D Much of

4B beat

5D put

6A last 

7B a unique

8D we were

9C representatives

10D therefore

15D pear

16A sword 

17A has written -> wrote

18B wear -> worn

19C amount -> number

48A Please ___

49B You shouldn't have ____

50D The concert was ____

Question 1.B. Having won

Question 2.B. shadow

Question 3.D. Much of

Question 4.B. beat

Question 5.D. put

Question 6.A. last

Question 7.B. a unique

Question 8.D. we were

Question 9.C. representatives

Question 10.D. therefore

Question 15.D pear

Question 16.A. sword

Question 17.A.has written 

sửa: wrote

Question 18. B:and wear 

sửa: to wear

Question 48. А. Please arrive early so that we can start our meeting early.

Question 49. B. You needn't have left the house in such weather.

Question 50. D. The concert was extremely successful.