It is a common practice in China that the bride at the weeding ________ be dressed in red to ensure good luck. 

–________ you turn down your radio, please? –Yes, I can.

I ______ tell you with certainty that he won’t be able to finish it before the deadline. 

The weather turned out to be fine yesterday. I ________the trouble to carry my umbrella with me. 

Teachers        be sensitive to the development level of each student so as to help them better.