Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 44 to 50.

As heart disease continues to be the number-one killer in the United States, researchers have become increasingly interested in identifying the potential risk factors that trigger heart attacks. High-fat diets and "life in the fast lane" have long been known to contribute to the high incidence of heart failure. But according to new studies, the list of risk factors may be significantly longer and quite surprising.

Heart failure, for example, appears to have seasonal and temporal patterns. A higher percentage of heart attacks occur in cold weather, and more people experience heart failure on Monday than on any other day of the week. In addition, people are more susceptible to heart attacks in the first few hours after waking. Cardiologists first observed this morning phenomenon in the mid-1980, and have since discovered a number of possible causes. An early-morning rise in blood pressure, heart rate, and concentration of heart stimulating hormones, plus a reduction of blood flow to the heart, may all contribute to the higher incidence of heart attacks between the hours of 8:00 A.M. and 10:00 A.M.

In other studies, both birthdays and bachelorhood have been implicated as risk factors. Statistics reveal that heart attack rates increase significantly for both females and males in the few days immediately preceding and following their birthdays. And unmarried men are more at risk for heart attacks than their married counterparts. Though stress is thought to be linked in some way to all of the aforementioned risk factors, intense research continues in the hope of further comprehending why and how heart failure is triggered

The word "potential" could best be re-placed by which of the following?

The school was closed for a month because of serious ………… of fever.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

I decided to go to the library as soon as I _______.

Do you know who ___________ the fact that sound travels in waves?

You can go to the party tonight _______ you are sober when you come home.

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Jack had to skip breakfast; otherwise, he will be late for class

Mark the letter A, B, C, or D on your answer sheet to indicate the word CLOSEST in meaning to the underlined word in each of the following questions.

A lack of qualifications can be a major obstacle to finding a job.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions. 

I wish we had gone somewhere else for the holiday.

It seems that you have to cope with the stresses and strains of the job, ___________?

The restaurant has a very _______ menu. Every day there are several delicious dishes to choose from

________ wait for no man

Mark the letter A, B, C, or D on your answer sheet to indicate the word CLOSEST in meaning to the underlined word in each of the following questions.

In astronomy, a scale of magnitude from one to six denotes the brightness of a star

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

It's ages since I last saw a Hollywood film

Most people prefer ________ at home rather than ________out on rainy days.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions

"Why didn't you join your friends on the trip?" she asked

In most _____ developed countries, up to 50% of _____ population enters higher education at some time in their lives