I like the house in ________ I used to live.

There are three ______ students on the playground.

English is too hard for me to study well. I don’t want to learn it any more.－Don’t . It is useful in the future.

What would you do if _________ eighty-year-old man fell down in front of you? —-I don’t know. Maybe I will help him.

To their great _______, they found their son arrived home safe before the storm.