With economy developing at great speed, our city has _____ quite a few changes in recent years.

The little boy _____on the mat ____ to his parents that blackbirds had _____their eggs on Mars．

A pilot climbed into the jet and off he ______, leaving the ground far behind.

Linda’s parents died when she was a baby, and she was _________by her aunt.

 Though ________ in San Francisco, Dave Mitchell had always preferred to record the plain facts of small-town life.