1)

- stopped
- packed
- taken
- arrived
- spoken
- decided
- driven

2)

- has emptied
- has answered
- have walked 
- have lost
- has bought
- has broken
- have cleaned
- has left
- has finished

3)

a) I haven''t finished my homework yet
b) I have already done my homework 
c) I have just finished my homework 
d) He has gone home already
e) Mark has just came back home 
f) They have just bought a new house
g) We haven't had lunch yet
h) The train has already left the train station 
I) Has the train left yet?

4)

- has gone
- have seen
- haven't had
- haven't seen
- has won
- haven't met

5)

a) have lived/since
b) have worked/for
c) have been/since
d) has worked/for
e) have had/since

6)

- yet
- just
- yet
- already
- just
- yet/already
- just
- yet
- just