The USA and Canada are both on the same (a)   .

Open the window I can't (a)   in here.

We don't know what is the (a)   of Covid -19 virus.

The (a)   of the buildings caused by earthquake was very severe.

There's a big Sale!! All the shoes are 50 (a)   off.

The factories (a)   thousand of new things every hour.

Glass has a smooth (a)   .

Most of the furniture in my house are made from (a)   .

Recycling should become a (a)   if we want to save and protect our planet.