unit 3

ex-6
1-horrible,  2-lousy,  3-cloudy,  4-dirty,  5-crowded,  6-filthy,  7-unfriendly,  8-disgusting,  9-awful
ex-8
1-b,  2-d,  3-a,  4-c
ex-9
1-go,  2-do,  3-take,  4-go,  5-do,  6-go
ex-10
1-b,  2-a,  3-d,  4-c,  5-f,  6-e
ex-11
1-was having, stole  2-has been repairing  3-has been lying  4-were exploring ,appeared  5-was skiing, broke 6-has been working
ex-13
1-ago,  2-for,  3-ever,  4-never,  5-since,  6-already,  7-yet,  8-while,  9-when,  10-so far
ex-16
1-am writing,  2-came,  3-are staying,  4-has been,  5-have been doing,  6-have already been,  7-take, 8-haven’t been,  9-tried,  10-was,  11-was,  12-were enjoying