choose the correct answer a, b or c.
11. they won the first prize two years ……
a. just b. ago c. yet
12. we haven’t left the library
a. recently b. yet c. ever
13. have you been living here?
a. so far b. how long c. since
14. this place has changed our last visit.
a. for b. since c. already
15. alex has been going out a lot .
a. last b. recently c. yet