After a careful survey about the cause of the newly-built bridge, they finally came to a(n) _________ that it was due to the heavy rain.

d I smoke here—I’m afraid smoking is not allowed here. If you _______, go to the smoking room, please.

In my opinion，not all inventions were invented by ________ accident.—Well，you do seem to have ________ point.Inventing needs much time and hard work.

When I passed the river, I saw some children ______ on the sand.

He goes to school early on workdays ____ Saturday and Sunday.