3:1.uncomfortable
2.inexperienced
3.unfriendly
4.unpossible
5.impolite
4:1.for
2.since
3.for
4.since
5.since
6.since
7.for
8.for
9.since
10.since
5:1.Elia has already read that book
2.Have they arrived in Australia yet?
3.The film hasn't started yet.
4.I have already had dinner.
5.David hasn't finished his homework yet
6:1.I have just hurt my arm
2.The film has just begun
3.It has just started raining
4.She has just gone to Tunisia
5.They have just eaten a lot of chocolate