—Have you _____ had dumplings? —No, not _____. 

 —________is a boat ticket for children?—How old is your child? It’s free for kids under three years old.

It is dangerous for teenagers to give out too much     about themselves on the Internet. 

—I hear Mr. Wang will test us in English ________next week. —Yes, that’s right.

Beihai Park is one of __________ parks in Beijing.