The teacher couldn’t make himself ____ attention to because students were addicted to the short message.
—Thank you for your coffee. —But you________ it.
Lily seems to know a lot about Hong Kong, but she has never been there.
We all know the truth there are air, water and sunlight there are living things.
__ her hair getting gray, she has decided to have it dyed.
The invention of artificial hearts marked a turning point in the battle heart disease.