42.（ ）of the twins was arrested, because I saw both at a party last night.

18.Some martian rock structures look strikingly like structures on Earth that are known（ ）by microbes.

17.Timothy Ray Brown, the first man cured of HIV, initially opted against the stem cell transplantation that（ ）history.

16.“It’s a shame that the city official should have gone back on his word.” The modal auxiliary SHOULD express（ ）.

15.“If I were you, I wouldn’t wait to propose to her.” The subjunctive mood in the sentence is used to（ ）.

14.“I wondered if I could have a word with you” The past tense in the sentence refers to a（ ）.

13.Ms Ennab is one of the first palestinian（ ）with seven years racing experience.

12.She followed the receptionist down a luxurious corridor to a closed door,（ ）the women gave a quick knock before opening it.

11.（ ）combination of techniques authors use, all stories—from the briefest anecdotes to the longest novels — have a plot.

30.Finning is a cruel（ ）in which the shark’s fins are lopped off, and the live shark is thrown back to sea.

29.If you are an athlete, strong abdominal muscles help you ensure a strong back and freedom from injury during（ ）upper-body movement.