=>
A/
1. poisonous 
2. poisonous
3. communication
4. communication
5. inventors
6. invented
7. medical
9. medical
10. to meet
11. to join
12. to change
13. to write
14. left
15. had had
16. had arrived
17. had left

B/
1. If the party weren't boring, we wouldn't leave it early.
2. If the test weren't difficult, the students could finish it all time.
3. If the rain weren't heavy, my father would leave from his office early.
4. If Mr.John didn't have a broken leg, he could ride his bike.
5. If they didn't play very badly, they could win the game.
6. If the weather weren't fine, they could continue the game.

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