Rose, you       leave your school things on the floor like this. Keep your room clean and tidy.

 ——Can I get out in the daytime?——No. The school rules state that no child _____ be allowed out during the day, unless accompanied by an adult.

－__________ can you finish your homework, Ben?－ In thirty minutes. 

The man over there _________ be over fifty. He looks so young.

________ people used the computer thirty years ago, but now it’s very popular.