6. Many teenagers show signs of anxiety and _______ when being asked about their future.
a. depress b. depression c. depressing d. depressed
7. Constant _______ of attack makes everyday life dangerous here.
a. threat b. threaten c. threatening d. threateningly
8. No one can predict the future exactly. Things may happen _______.
a. expected b. unexpected c. expectedly d. unexpectedly