Tuna, ................., may weigh up to 1,000 pounds. a. is the sea giant b. can be giants of the sea c. one of the sea giants d. the sea of the giant 55. Physical fitness exercises can cause injuries ................. the participants are not careful. a. that b. to c. if d. with 56. Total weight of all the ants in the world is much greater than ................. a. to all human beings b. all human beings is that c. that of all human beings d. is of all human being 57. ................. for overall health. a. Extra fiber in one's diet is helpful b. Extra fiber is one's helpful diet c. Helpful one's diet is extra fiber d. One's diet is helpful in extra fiber 58. Elephants scratch themselves with sticks .................. a. holding in their trunks b. in their trunks holding c. hold in their trunks d. held in their trunks 59. Van Gogh's "Sunflowers" .............. $39.9 million, three times the previous record. a. once sold for b. for sale once c. selling for once d. for once sold 60. Some monkeys, ................., use their tails in a way similar to a hand. a. like the spider monkey b. spider monkey likes c. to the spider monkey d. the monkey likes the spider