Like some of my classmates,I can’t live up to my teachers’ expectations., I let them down[ ]

We often hear her _________ this song.

to think that roses were ______ red or white, but now I know there are yellow and blue roses.

The Sunday of May is Mother’s Day and a time to be _____________ to our mothers.

About _________ of the engineers in my company seem to be in their _________.