The coal is sold ____ the ton and buyers can’t pay using credit card, so we have to pay ___ cash.
Measures must be taken to prevent pollution ____ happily.
Despite being taken from very different sources, the results are remarkably ____.
-What about the price of these washing machines? -They are equal in price to, if not cheaper than, ____ at other shops in the street.
The Rubber Duck ____more attention to the two parks than usual during Mid –Autumn Festival and National Day holidays .
Had he not come an hour earlier, he___the secret that his mother was always there.