Do you know the boy________ is sitting next to Peter?-YesHe is Peter’s friendThey are celebrating his ________ birthday

___ is known to all, China is a developing country, belonging to the third world.

Salley________Beijing for Shanghai and________there ever sinceYou can go and pay her a visit on your way to Hangzhou

How many students are there in yourclass ____ homes are in the country

If you meet some new words, you can ___________ in a dictionary.