Although they are very succinct-that is why they caught on-cliches are wasted words because they are（）expressions rather than fresh ones

单项选择题After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and （）

A. runs away
B. charges for
C. falls off
D. merges into

单项选择题Being the manager of a large corporation, he has a great deal of ______ to deal with every day.