1. Snakes have an organ in a pit on their heads _____________ infrared rays. a. detects b. a detection of c. it detects d. that detects
that detects
2. Helium is not inflammable, ________________ therefore safer than hydrogen. a. that is b. and is c. but is d. and it
b. and is
3. In 1849 Walter Hunt, _______________ American inventor, patented a design that served as the basis for modern safety pins. a. an b. he was an c. being d. who was, as an
an
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