2.
1)Who
2)Which
3)Who
4)Which
5)Which
3.
1)Already
2)Yesterday
3)Ever
4)This year
5)Yet
4.
1)At
2)To
3)To
4)By
5)In
5.
1) I never traveled by ship.
2)Last weekend I spent with my aunt and uncle.
3)He just found his book.
4)Did you buy a ticket to Omsk yesterday?
5)We spent last summer on the beach