URGENTE, me ajudem por favor!!!

1) Choose the correct answer:
A) I ____ her for a week.
( ) Was ( ) Have been

B) My teacher ____ sick for two days.
( ) Has been ( ) Was

C) I ____ studying English since January.
( ) Have been
( ) Studied

D) We ____ in that firm since 2017.
( ) Worked
( ) Have worked

E) My son ____ anything since Tuesday.
( ) Didn't eat
( ) Hasn't eaten

F) They ____ just.
( ) Have arrived
( ) Arrived

G) Mary ____ just ____ out.
( ) Went
( ) Has gone

H) I ____ just ____ my book.
( ) Opine
( ) Have opined

I) She ____ already ____ the Bill.
( ) Has paid
( ) Paid

J) They ____ already ____ their homework.
( ) Finished
( ) Have finished

K) They already ____ the letter?
( ) Have signed
( ) Signed

L) I ____ there yet.
( ) Haven't been
( ) Wasn't

M) You ____ the Bill yet.
( ) Wasn't
( ) Haven't been

N) ____ John ____ his new car yet?
( ) Has bought
( ) Bought  ​