In recent years, the advancement of technology has been progressing at an astonishing speed.

He is a very diligent student.

He is working diligently to make the project successful.

Alkynes play an important role in organic chemistry.

She was overjoyed to hear of his success.

He rejoiced when he heard the news of his promotion.

He is storing gold as a savings.

In this material, it is difficult for electrons to cross the valence band.

That topic is considered a taboo among them.

I like fishing in the coastal waters.