Grandma ____ ____ yesterday.
将两个铅柱的底面削平.紧压,两个铅柱结合了起来,在下面吊挂一个重物,它们仍没有分开,如图,该实验说明了( )
A few months later, I ____ ____ ____ ____the city.
He has ____ ____ ____ ____ London.