don’t know why you are so concerned — it’s not your problem _____ .

"Merry Christmas! Boysand girls".—______________..

______ the beginning of the 19th century did scientists know that all matter is made up of atoms.[ ]

29I have offered to take care of the three children as well as the pet dog _____ a week’s accommodation

The post office is near here. You can go there _____ foot. You don’t need to go there _____ a bike.