Choose the correct variant:13. They were in Spain last summer, ______?(a) were

Choose the correct variant:
13. They were in Spain last summer, ______?
(a) were they (b)isnt it (c)didnt they (d)werent they
14. The water of the Dead Sea is so salty that ____ live in it.
(a) nothing can (b)nothing cant (c)nothing (d)anything cant
15. It wasnt easy for Polly ____ progress in history.
(a) to do (b)do (c)to make (d)makes
16. We _____ to a wonderful pop concert last Saturday.
(a) have gone (b)had gone (c)were going (d)went
17. I have never seen this film________.
(a) so have I (b)I havent too (c)never did I (d)neither have I
18. Mr. Adams is fond ______ speeches in public.
(a) to make (b)making (c)make (d)of making