p51~53

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문제 해석부탁드립니다..

15,16,18

15. Customers complain that billing errors from the online shopping site are becoming more ______

a. frequency

b. frequently

c. frequented

d. frequent

16. Usage of cellular phones _______ not permitted on the aircraft during takeoff and landing.

a. are

b. is

c. will be

d. been

18. During the meeting with the board, Mr. Althrop announced that the company _______ the building project ahead of schedule.

a. finishing

b. finishes

c. finished

d. finish

30. Many corporate leaders _______ the construction of manufacturing factories in Latin America to elevate employment rates.

a. to recommend

b. were recommending

c. recommends

d. are recommended

32. Tintinit Electronics ________ their production goals after studying sales figures at the end of each quarter.

a. revising

b. recises

c. is revised

d. to revise

36. ________ in technology for creating special effects for films have helped decrease costs of movie production.

a. advancing

b. to advancce

c. advanced

d. avances