过压活门(OPV）正常情况下是

The boy acted     （）       he had never lived in Canada before.

He demanded that the laboratory report （）    immediately after the experiment was done.

He is not （）        a fool   （）     .

A steel plant is a place      （）   I am longing to visit these years.

Do you know who lives in the building   （）       there is a well.

She had three sons, all   （）       became doctors.

I, （） your good friend, will try my best to help you out.

Did she tell you anything （）        had happened to her?

My hometown is no longer the same      （）    it used to be.

Is this the leaning tower       （）   Galileo did experiments centuries ago?