Now most families have only one child _____ our country’s one-child policy.
Lily studies Chinese very _____and her Chinese is _____in her class.
Nobody teaches______ English. I learn it all by______.
—It is useful book.—Yes, it tells us how to play football.
Although he is only a _____ boy. He knows a lot.
To help the sick people in the hospital is _____ for me .