24. Building this bridge has already been too costly in terms of people who _____ while working on it. (A) be kill (B) been killed (C) have killed (D) have been killed

33. Which of the following statements is true about “Lion Lights”? (A) “Lion Lights” can frighten lions away because they will go on and off in turn. (B) “Lion Lights” became popular in Kenya only after Richard attended TED Talks. (C) Richard’s successful experiment with fire and scarecrows led him to invent “Lion Lights.” (D) “Lion Lights” is highly effective in driving lions away, but can’t scare away other animals.

24. Building this bridge has already been too costly in terms of people who _____ while working on it.
(A) be kill
(B) been killed
(C) have killed
(D) have been killed

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