... being done now. 17. When did they built this house? A. When this house was built/ B. When is this house built? C. When did this house build? D. When was this house built? 18. A person who teaches ... o'clock. 26. They don't use this room very often. A. This room is very often used. B. This room isn't very often used. C. This room is used not very often. D. This room isn't used very ... its center. A. thing B. nothing C. something D. everything III. READING COMPREHENSION A. Read the following passage carefully then choose the answer (A, B, C, or D) which you think is correct...