Efficient means someone who is working in a well-organized way and plans things well. So think of what a character would do being "well-organized" "well-planned" ...etc.
Answer:
I think it's a metaphor, it imply something that is broken or unable to repair
The correct option is D.
The Mexico city was built on the ruins of an old lake. The lake was drained in order to provide the needed land for the city and water has to be regularly pump out of the underground aquifers in order to prevent flooding and also to provide drinking water for the city. This affected the supporting soil structure and result in the sinking of the city. The city has sunk by about 30 feet in the last 100 years and this has caused a lot of damages which are quite expensive to repair.
Answer:
Irregular
Explanation:
You can think of "regular" as several neat rows or many similar things. They are all "regular" with each other and you can sort of predict what will come next.
There does not seem to be a specific pattern here, so we can conclude the answer most likely is irregular.
