13. Water is _____ to life on Earth. All plants and animals must have water to survive.
(A) distinctive (B) transparent
(C) statistical (D) indispensable
18. He sat still in front of the TV, _____ by the news of the violent attack on the United States Capitol.
(A) shocked (B) been shocked
(C) having shocked (D) to have been shocked
22. Most residents in this community are aged World War Two soldiers, _____.
(A) many of them live alone
(B) many of them living alone
(C) and many of whom live alone
(D) and many of whom living alone
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