By the first day of August, 2007, the PLA has its ______ birthday.
Now most families have only one child _____ our country’s one-child policy.
— Hello, this is Tom. Is Jack in?— Sorry, he to his uncle’s home. May I take a message?
—I’m worried about tomorrow’s math exam.— ______ . I’m sure you will make it.
Mrs. White _______dinner when her son came home.
-What are you doing ? -I am _____my dictionary. I want to ____the answer.