1. He knew it was a avery --------- operation, but he was determined to carry it out.

difficult

dangerous

risky

troublesome

2. I told him to come ----- the house.

to

in

into

at

3. He was absorbed ------ deep thought.

at

in

with

on

4. 2a equal 10 and ---- a equal 5?

eventually

thus

therefore

thereby

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

eventually

thus

therefore

thereby

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

if

in case

unless

in case of

7. He refrained ---- passing any comment.

to

of

by

from

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

unlikely

catastrophic

imminent

undeserved

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

persistently

constantly

consistently

sagacity

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

innocuous

digressive

derogatory

persistent