Completar frases Video LessonVersión en línea Choose a suitable word to fill in each blank. por Thuy Tran 1 There are 1 . of specialized cells in our body . These cells always grow and 2 . . When a ( n ) 3 . change happens , cancer will 4 . . 5 . cell growth creates masses of tissues called 6 . . The two types of tumors are benign tumors and 7 . tumors . The causes of cancer may be some 8 . traits or environmental 9 . . Excessive sun 10 . and 11 . in cigarettes are two things we should avoid . 12 . cancer is currently the most prevalent type and 13 . cancer causes the most deaths . Since the 1990s , the 14 . rates of cancer have decreased significantly . 15 . are being improved , and hope remains in the battle against cancer .
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