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C21U2LB GE2
Author :
Modern English
1.
You can control the systems when you're at home. You can control them when you're somewhere else. (either...or)
2.
With a sophisticated security system, you can monitor your house at work. You can monitor your house on vacation. (both...and)
3.
A high-tech home can adjust the temperature when it gets cold outside. It can adjust the temperature after it warms up. (not only...but also)