Question 23: Mrs Yen forgot to
A. turn over
B. turn off
the faucet when she left for work.
D. turn up
sulphur and nitrogen
C. turn down
Question 24: Chemical and wastes from factories consist
oxides that are dangerous for our health
B. at
D. On
Question 25: Which one has the underlined part pronounced differently from the others?
A. in
A. played
B. watched
C, of
C. passed
D. washed
of the blanks from 26 to 30.