Now most families have only one child _____ our country’s one-child policy.
How long have you ______ this book ?
You can visit Hong Kong in ______ season because there are many modern shopping malls there.
—Shall we go to Australia for the long holiday ?--Sorry. I _______ there twice.
I became a teacher ten years ______. I have been a teacher _______ 2008.
_______ nice time the Smiths had in China!