I) 1. I have looked
2. have been cleaning
3. has broken
4. haven't been wearing
5.have come
II) 1. the most attentive
2. larger
3.eldest
4.the most interesting
5. worst
III) 1. -, the,-
2. a,a
3. -, the, the
4.the, -, -
5.the, the
IV) 1.got up, were drinking tea
2.What did he do
3. wasn't playing
4. opened, was sitting
5. was sitting