16 Choose the underlined part A, B, C or D that needs correcting. Picture 5 A: A B: B C: C D: D 17 Choose the underlined part A, B, C or D that needs correcting. Picture 4 A: A B: B C: C D: D 18 Choose the word whose stressed pattern is pronounced differently from the others. A: currency B: computer C: pollution D: allowance 19 Choose the best answer A, B, C or D to complete the sentence. Question 9. What __________________ if you saw a UFO? A: did you do B: do you do C: will you do D: would you do 20 Choose the best answer A, B, C or D to complete the sentence. Question 12. He asked me what the conservationists __________ so far to protect our environment. A: do B: did C: have done D: had done