将标准状况下的 aLHCl气体溶于1000g水中,得到盐酸密度为b g/cm3,则该盐酸的物质的量浓度是
The children all turned ____ the famous actress as she entered the classroom.
Edward, you play so well. But I ______ you played the piano.
She brought with her three friends, none of ______ I had ever met before.
I tried phoning her office, but I couldn’t _______.
His sister left home in 1998, and _______since.