1.Why has no one from other planets sent us _________ (信息)?
2.They __________ (更喜欢) life On Mars.
3.I think they're keeping it __________ (秘密).
4.With so many stars in the universe,are we __________ (单独的)?
5.You can _________ (借) it.
1.They have lived here for 10 years.（划线部分提问）
________ ______ have they lived here?
2.It has taken him two hours to draw the picture.（同义句转换）
He has _________ two hours _________ the picture.
3.Kate has already read the book.（改为一般疑问句）
_____ Kate read the book _________?
4.Mary has already saved some money.（改为否定句）
Mary _______ saved ________ money yet.
5.Astronauts have already been to the space station.（划线部分提问）
__________ have astronaut ____________?