One’s life has value _____ one brings value to the life of others.
Grandma does all her own shopping and cooking—I have never seen ____aged person.
Our English teacher told us to find out ____the differences between American English and British English lie.
—Lisa, what do you think of the job of being a nurse? —In my opinion, it ____ be difficult sometimes though it seems easy.
Tom makes ____a rule to give a summary of the new important points after class.
Into the dark apartment ___ , who was quite surprised when everyone shouted “Happy birthday!”