My keys are inside the house.

He is quite a good cook.

I think his Japanese has improved quite a bit, hasn't it?

I am busy with work during the daytime.

The movement of tectonic plates can cause earthquakes.

His presence dominated the entire room.

Please use the emergency stairs in case of a fire.

Due to the earthquake, the city declared a state of emergency.

An isotope refers to elements with the same atomic number but different numbers of neutrons.

Rare earth elements are essential materials for the manufacture of electronic devices.