While typing, Helen has a habit of stopping ______ to give her long and flowing hair a smooth.A now and then B.over and over C.up and down D.here and there
This time last year I paid a visit ______Shandong which is 5000 kilometers _____.
.He was about to leave ______the telephone rang; ______was from his mother.
.We must take some photographs ______the microcomputer.
They made their way in the shop _______shoppers.
The old lady died from the _____on her head; she was _______when cleaning windows on the ladder when she fell off it.