1£®The boy was waving (wave) to us when we turned back to say goodbye to him.

2£®Scientists have many theories about how the universe came(come)into being.

3£®She had to walk home with her bike stolen(steal)£®

4£®The suggestion made(make) by the foreign expert was adopted by the manager.

5£®Having failed(fail) many times£¬he didn't lost heart.

6£®It was difficult to calm down the football fans.

7£®By no means can theory be separated from practice.

8£®Rockets are used in the exploration(explore) of the universe.

9£®She sang to the music with her hand waving(wave) gently.

10£®The police used unnecessary violence(violent) on the crowd.