1. 2a equal 10 and ---- a equal 5?

eventually

thus

therefore

thereby

2. I'll open the umbrella ---- it rains.

if

in case

unless

in case of

3. He refrained ---- passing any comment.

to

of

by

from

4. When we show black smoke billowing from the wing of the plane, we were certain that disaster was-----

unlikely

catastrophic

imminent

undeserved

5. The man who is ----- hesitating which of the two things he will do first, will do neither.

persistently

constantly

consistently

sagacity

6. Your-remarks spoil the effect of yourspeech; try not to stray from your subject.

innocuous

digressive

derogatory

persistent

7. The young man was quickly promoted when his employers saw how -- he was

Indigent

Indifferent

Assiduous

Lethargic

8. All questions must be original, that is, formulated ---- for the test.

really

exclusively

certainly

equally

9. At such a serious moment, your ----- is inappropriate.

courtesy

levity

pertinence

solemnity

10. Because he was --- by nature, he prefered reading a book in the privacy of his own study to visitng a night club with friends.

an exhibitionist

an introvert

an egoist

an adversary