There was a________look on his face when he met with the________problem.[ ]

ou see who the driver was—No, so quickly,that I couldn’t gat a good look at his face.

Tu Youyou was given the Nobel Prize in Physiology or Medicine of 2015 due to her ________ to discovering a new drug to treat parasitic diseases.

It’s just_____ among countries to host the Olympics as to win an Olympic medal

It is true that knowledge ______ rather than being taught.