53. In 1989, a(n) _______law was passed by the United Nations to stop people putting waste into sea.
My wife usually saves some money by ________ the prices of everything she buys.
He is always ready to help others. That's one of his ________ .
-------Mrs. Green looks very worried. _______ -------The teacher called her and said her son was ill.
------ Our holiday cost a lot of money. ------ Did it? Well, that doesn’t matter ______ you enjoyed yourselves.
The question is too difficult and we found ________.