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

_________ the room, the man was no longer there.

A. Entering B. When we entered C. On entering D. Having entered

The clerks who are happy to wait for their customer will get promoted soon.

(A) Clerks

(B) Wait for

(C) Customer

(D) Get promoted

_________ anxious to please us, they told us all we wanted to know.

A. Be B. To be C. Being D. In being