Where does John live?—He lives on ______ floor but he doesn’t use a lift to go up and down.

.Mum, ________my teacher, Mr Wang.

There are ________ students waiting in the hall, ________?

____ in1943 _____ the harmful smog made its appearance in Los Angeles.[ ]

I think saving water is more important than recycling paper in our daily life.— I disagree. Recycling paper is saving water.