It’s good to know ________ the dogs will be well cared for while we’re away.

The number of the teachers twohundred in our school.

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.

7. David was lying in bed, _____ , listening to an English pop song.

He lives on ________ floor in that building.