当发动机引气由中压级提供时，引气压力是由哪个活门调节

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?

I’ll never forget the day （）         I joined the army.

Those （）       not only from books but also through practice will succeed.

Did you tell your mother all    （）      you had seen on the way home?