一What will the weather be like tomorrow?一Itbe rainy ,cloudy or sunny．Who knows? Even the weather report is not always right.

the students in this school is about four thousand,of them are boys．

_____ do you go hiking? — Once a week. [ ]

Have you done your chores? We’re leaving ________an hour．[ ]

Space exploration has been made ______ with the development of modern science and technology.