Every Monday morning, students in our school wouldstand at attention, watching the national flag .

n never forget the days we spent together in the summer camp.—Well, especially the day it suddenly began to rain in the middle of the night.

.Traveling by plane is the most comfortable ， but it is also the _________ .

Excuse me, sir. Would you please the total cost of the trip— All right, I will make it at once.

Small blocks of time can also be made full ________ of ________ the problems in our study.