Английский язык, нужна помощь!

1. __________ is a software program designed to protect your computer or network against computer viruses.
d)An antivirus program
2. A computer virus _________ by attaching copies of itself to other computer programs or data files.
b)replicates
3. Computer viruses currently cause billions of dollars worth of economic _______ each year
d)damage
4. Viruses can ________ through email attachments, application programs on your computer, or application programs installed from disk drives.
c)spread
5. The _______ disk drives are quickly becoming a thing of the past.
b)floppy
6. It is ________ to download any software programs from the Internet that are not intended as free software.
a)illegal
7. The virus enters your system when a copy of an infected program is ______ from the floppy.
a)loaded
8. The virus enters your system through a floppy disk, and then ________ the hard drive.
d)infects
9. Illegally pirated programs are ________ in the Internet.
a)available (Также, здесь должен сказать "on the internet". Я никогда не слышала обстоятельство, в которым мы можем сказать "in the internet")
10. The most important ________ of a computer virus is its ability to replicate itself.
d)feature
11. If I were you, I _____ to her.
a)would talk
c)would have talked
(Оба варианты грамотные и верны. Хотя, я думаю, что они хотят "с" Чуть-чуть разница в значении.)
12. If Lucy go to Rome, John ______ her there.
b)will follow
c)would follow
(Сначала, это должно сказать "If Lucy goES to Rome..." Также, Оба варианты грамотные и верны. Хотя, я думаю, что они хотят "b"; Чуть-чуть разница в значении"
13. If I _______ how to play American football, I would explain it for you
d)knew
14. If she _____ about the new snowfall, she wouldn’t have gone snowboarding.
a)had known
b)knew
(Оба варианты грамотные и верны. Хотя, я думаю, что они хотят "а" Чуть-чуть разница в значении. )
15. If he ______ so well, he wouldn’t have become a world champion.
d)had driven (Хотя, нужно сказать "he had not driven")
16. If I were younger, I ____ on a backpacking tour around Europe.
c)would go
17. If they ______ extreme sports, they would have stayed at home.
d)enjoyed
(Хотя, в этом нет смысли. Правильно говорить "If they enjoyed extreme sports they would NOT have stayed at home")
18. If we _____ a computer, it’ll take too long.
d)don’t use
19. If you _____ to meet Michael, you’ll have to come back tomorrow.
a)want
20. If I were him, I ____ that motorbike immediately.
c)would sell
d)would have sold
(Оба варианты грамотные и верны. Хотя, я думаю, что они хотят "d". Чуть-чуть разница в значении.)

1 d)An antivirus program
2 b)replicates
3 d)damage
4 c)spread
5 b)floppy
6 a)illegal
7 a)loaded
8 d)infects
9 a)available
10 d)feature