1. The behavior of many volcanoes __________ very difficult to predict, especially the more explosive types. a. are b. is c. that d. being
B
2. __________ more than 2,000 minerals are known, nearly all rocks are formed from seven mineral groups. a. Although b. However c. Despite d. Since A
A
3. Alexander Graham Bell worked with deaf students before __________ the first telephone in 1876. a. designed b. was designed c. to design d. designing
D
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