6. As we joined the big crowd, I got ______ from my friends.

A. spared B. separated C. missed  D. lost

7. Driving a car is not as difficult as you imagine, if you ______ the rules.

A. depend on B. believe in C. stick to D. turn to

8. The Internet has brought _______ big changes in the way we work.

A. about B. out  C. back D. up