1. more dangerous
2. better
3. hotter
He have finished training
She have scored twenty points in the match
We have watched all the Champions Leauge matches this season
1 c 2 c 3 b 4 c 5 b 6 b 7 b 8 a 9 b 10 b 11 b 12 b 13 b 14 b 15 b 16 c 17 b 18 c 19 c 20a 21 c 22 a 23 b 24 a 25 a 26 c 27 a 28 c 29 b 30 b
I have just cleaned my room.
The cat has just caught a mouse.
Тут используется Pr.Perfect: has/have + V3, потому что при just используется это время.
Has для He, She, It; Have для остальных.