How could you ______ my sister so easily in the crowd?— Because she stood out in her red dress. [ ]

The old woman has _______________ too many hardships in the past 10 years．

Was it not until you began to work ___ how much time you had wasted?

regret _____you John has been fired .—I can hardly believe my ears .He is such a fine worker .

Team leaders must ensure that all members ______theirnatural desire to avoid the embarrassment associated with making mistakes.