When I got to the office, I to lock the front door

A) was / had appeared
B) has been / will appear
C) has been / appears
D) is / appeared
E) had been / appeared
21. 21. Although aspirin _____ primarily regarded as a
simple pain killer, it _____ to prevent heart attacks,
too.
A) is / helps
B) was / will have helped
C) has been / would have helped
D) is / was helped
E) will be / had helped
22. 22. Until recently, the first European who ____ to the
New World______to be Christopher Columbus, who
was a famous Italian navigator.
A) had sailed / was believed
B) has sailed / is believed
C) has sailed / had been believed
D) would sail / has been believed
E) sailed / had been believed
23. 23. The committee is determined not to leave _____
they have finished the project.
A) until
B) by the time
C) just as
D) since
E) when
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24. 24. Shelly ____ her mid-term mark because she_____
to her instructor.
A) won’t learn / hasn't listened
B) hadn't learnt / wouldn't be listening
C) can’t learn / didn’t listen
D) couldn’t learn I wasn’t listening
E) wouldn't learn / hadn't listened
25. 25. Unfortunately, the new earthquake regulations
;_____ any difference to the people who _____ under
the buildings.