In the students’ eyes, Mrs Smith is a mother more than a teacher.          she treats the students just like her own children.

 I lost my way in complete darkness and, _____matters worse, it began to rain.

   —Do you think I should wear a thick coat?—Yes, certainly. ______, you also need a compass.

The expert offered us another piece of advice , ___ of great help to our program. 

The most impressive sight in China，one of the wonders of the world，_____  the Great Wall.