In ancient times, dogs weremainly ______helping people hunt( 打猎) .Now they are more useful-they can help theblinds, search for the bad eggs,…

Don’t worry about it ____ time to learn English

Mike decided_______ the museum this Sunday.

It has been said that in no country Britain can one experience four seasons in the course of a single day.[ ]

25The American Civil War lasted four years _____the North won in the end