2. Helium is not inflammable, ________________ therefore safer than hydrogen. a. that is b. and is c. but is d. and it

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

29 identify errors

10. _____________ does not circle around the earth was proven by Galileo. a. Since the rest of the universe b. As the rest of the universe c. The rest of the universe d. That the rest of the universe

7. The higher the content of carbon dioxide in the air, ________________ a. more heat it retains b. than it retains more heat c. it retains more heat d. the more heat it retains

21 identify errors

9. ____________ flying, a bat emits a rapid series of ultrasonic signals, which bounce off any object in its path. a. When it b. When it is c. It is d. When is

16 identify errors

28 identify errors

6. _____________other cells in the body, nerve cells are not healed or replaced when they are damaged or destroyed. a. Different b. Unlikely c. Unlike d. But

11. _______________ cell in the body is far from a capillary. a. Not b. No c. Not only a d. Neither a

23 identify errors

14. _____________ phobias do not involve loss of contact with reality, they may severely limit a person’s life. a. Although b. Despite c. That d. As