Choose the correct variant: 13. they were in spain last summer, (a) were they (b)isn’t it (c)didn’t they (d)weren’t they 14. the water of the dead sea is so salty that live in it. (a) nothing can (b)nothing can’t (c)nothing (d)anything can’t 15. it wasn’t 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 (a) so have i (b)i haven’t 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