just spend your time___ gains and losses, maybeyou’ll get nothing in the end．

It only ____ me half an hou to school every day last term.

The first visit to the Great Wall with my parents gaveme a deep_______.

.Nobody could______it when the bull broke into the shop and attacked two customers with its horns. The others just hurried away from it.

Doesn’t he lose heart even if the experiment hasn’t been working out— ________. Nothing defeats him.