In my opinion,life in the twenty-first century is much easier than _______.

Do you know the result of the ________ race? Yes. The winner is a boy ________ Lin Feng from Class 4.

He kept a little notebook, in which__________ the names and addresses of his friends.

My school bag is larger than _________.

Many doctors and scientists are working hard on curing AIDS. We hope AIDS _____ one day.