A．You could be missing opportunities as well.
B．No one can stay on the same job for long.
C．No prescription is effective in relieving stress.
D．People have to get married someday.

A．Repetition helps improve our memory.
B．Memory depends to a certain extent on the environment.
C．If we focus our attention on one thing we might forget another.
D．If we keep forgetting things we’d better return to where we were.