________to the man’s timely coming，the________boy was saved.

________ in the early 20th century，the school keeps on inspiring children’s love of art.                                                                       (2013·安徽，32)

_____ this house with that one, you’ll find this house is better. 

 Ladies and gentlemen, please remain ________ until the plane has come to a complete stop.

_______by the teacher, Bob has made great progress this term.