Which sentence uses the word efficient correctly? The flowers looked efficient after the warm summer rain.

My left shoe was so efficient, it hurt my heel when I walked.

It was more efficient to address all the letters at once than one by one.

When Mom asked if I wanted more soup, I told her one bowl would be efficient.

3. " it was more efficient to address all the letters at once than one by one"

martians or other types of aliens represent a unique fear as opposed to zombies. vampires and other types of monsters.   in most sci-fi stories, aliens come from other worlds and have different or more advanced technology.   abductions and experimentation on human bodies that involve these technologies, or the use of these technologies against human beings and the use of unknown "powers", are a type of fear that's different from that of other types of monsters.