单选题 Food systems ______ depend on natural resources like water, soil, land, minerals and fossil fuels.

单选题 Swans are graceful swimmers, but they’re ______ on land.

单选题 ______ are inevitable in such a short book on such a general subject!

单选题 The United States is very large but Canada is ______.

单选题 We are ______ that getting vaccinated is the best way to enforce our immune system.

单选题 Do you enjoy cooking or do you just see it as a ______?

单选题 She got some books out of the library and ______ herself in Jewish history and culture.

单选题 The biggest myth is that washing your hair frequently is bad, but there is no real ______ for that.

单选题 Car taxes will now vary according to the amount of carbon dioxide a particular car ______.