The music sounded，    the end of the class．

Some English scientists are identifying problems ____ technology in the 21st century. If solved, the solutions could change the world.                         

I was told that there were about 50 foreign students ________ Chinese in the school, most ________ were from Germany.

The experts advised ____________ our army ____________ modern weapons.

____ from a Chinese character meaning people, the mascot “Haibao” shows the character of Chinese culture.