In December 2008, Obama was _________________

The themes of the story are to do______children growing up.

Dutch tulips in Dafeng are so charming that _________ tourists go there and enjoy the beautiful flowers every day.

Yesterday, a man said he saw _______ UFO in the park. The police are looking for _______ UFO now.

Markhave hurried. After driving at top speed, he arrived half an hour early.