Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.
There have been concerns about health problem in the area recently as the last reported to cause the pollution.To stay from worries, we decided ___(1)___ a health check with the local doctor.We phoned to ___(2)___ an arrangement at 9 o'clock the next morning, the doctor welcomed us ___(3)___ the door with a lovely smile.After filling necessary forms, we were given different tests.All the tests were done very quickly with the net of modern ___(4)___.As she did the checks, the doctor said that a lot of people were worried about air pollution and came to help for health checks like us.