He charged me fifty yuan ______ it, but at first he said the work would be done free ______ charge.

_____ Sundays, they always have ______ their new clothes.

______ course Mr. Esters did not fail to make a note ______ it.

_____ the last ten years there have been great advances ______ telecommunication, especially ______ the development ______ computers.

Many children in Africa are suffering greatly ______ hunger.

The scientist would love to travel ______ the world ______ sea.

Bring the money ______you ______ case you need it.

______ other words, you can walk ______ a distant part of the office to check the information ______ putting the phone ______.

以这么快的速度　　   

既然，由于