The math problem is______difficult for me ______ work out.[ ]

How about the pollution in the countryside?—Luckily, it’s not as serious as _______ in the big cities.

_______ is the drink, please?—Ten yuan a tin.[ ]

The local people like that Italian restaurant because it both delicious food and good service.

When does your mother go shopping? 一Usually ______ Sunday mornings. [ ]