It's not _____ to go outside. You should stay inside for your own _____. (safe)
safe (adj): an toàn - safety (n): sự an toàn
Remember to turn off the lights and your _____ devices before going out. If you don't do that, you are wasting _____. (electric)
electric (adj): điện tử - electricity (n): điện
I think the machine has an _____ fault. I'll call an ______ to fix it. (electric)
electrical (adj): thuộc về điện - electrician (n): thợ điện