—He’s never stolen anything before,________he?—________.It’s his second time to be taken to the police station.
If you are in trouble,you can________the police________help.
It’s________cold________go swimming in winter in Beijing.
—How do you learn English? —I learn English________practicing conversations with friends.
—How do you study________a test? —I often study________a group.
The teacher said it was necessary________a foreign language well.