By the turn of the century, most of the inventions that were to bring in all the comforts of modern living has already been thought of. 

(A) By the turn of

(B) That

(C) Were to

(D) Has already been

Doctors believe there is better in this modern world of ours to try to prevent illnesses than to rely on medicines to cure them. 

(A) Doctors

(B) There is

(C) Of ours

(D) To

The guide told the tourists that it was a good restaurant specializing in seafood just round the corner from the museum. 

(A) The

(B) It was a

(C) Specializing

(D) Just round

Parks which are found in downtown areas where office workers and store employees can enjoy their lunch hours sitting on the green grass in clean, fresh air. 

(A) Which

(B) Employees

(C) Lunch hours sitting

(D) Fresh air

The freshman failed to follow the advice of her senior that he studied hard and not go out too much. 

(A) Freshman

(B) Her

(C) Studied

(D) Not go out

The office manager insists that his staff use all of their vacation time, but he hardly never takes a vacation himself.

(A) Insists

(B) Use

(C) Their

(D) Hardly never

Not one in one hundred children exposed to the disease are likely to develop symptoms of it.

(A) Not one

(B) Are

(C) Symptoms

4.  It

The notion that students are not sufficiently involved in their education is one reason for the recently surge of support for undergraduate research

(A) Notion

(B) Are not

(C) Their education

(D) Recently

The eastern bluebird is considered the most attractive bird native of North America by many bird-watchers.

(A) Bluebird

(B) Considered

(C) Native of

(D) By

It is difficult to write rules that tell exactly when we should apologize , and it is not difficult to learn how to do it 

(A) Difficult

(B) That

(C) When

(D) And