On Saturdays, students are very proud to be on the street to guide passers-by to obey traffic rules.
The computer system_________ suddenly while he was watching news on the Internet.
--Look! What are the Greens busy doing? -- Mrs Green is cutting the grass; _________, her husband is planting the roses.
____ I saw him, I knew he was the man the police were looking for.
--How do you like the film Frozen? --Great! Never before _________ a better one.
____ the small cottage in the countryside, they have a large apartment in the city too.